Bg. 9.3

अश्रद्दधानाः पुरुषा धर्मस्यास्य परन्तप ।
अप्राप्य मां निवर्तन्ते मृत्युसंसारवर्त्मनि ॥३॥

Text

aśraddadhānāḥ puruṣā
dharmasyāsya parantapa
aprāpya māṁ nivartante
mṛtyu-saṁsāra-vartmani

Synonyms

aśraddadhānāḥplugin-autotooltip__small plugin-autotooltip_bigasraddadhanah

without faith in revealed scriptures.
—those who are faithless; puruṣāḥplugin-autotooltip__small plugin-autotooltip_bigpurusah

man.
—such persons; dharmasyaplugin-autotooltip__small plugin-autotooltip_bigdharmasya

occupational; occupational engagement; of all principles of religion; of Dharma (the controller of religious principles); of Dharma; of religion; of religiosity; of religious principles; of religious principles, or of Yamarāja; of the constitutional position; of the demigod in charge of religion; of the execution of duties; of the personification of all religion; of the principles of religion; of the religious principles; of this occupation; of this process of religion.
—of this process of religion; asyaplugin-autotooltip__small plugin-autotooltip_bigasya

(the taking away) of this Ajāmila; about Him; by Him; for all these acts; for him; for such a person; his; his son; its; King Pṛthu; of a living entity; of a person; of Caṇḍavega; of Dakṣa; of Dhruva; of Dhruva Mahārāja; of her son; of him (Bali Mahārāja); of him (Bharata); of him (Brahmā); of Him (the Lord); of Him (the Supreme Personality of Godhead); of him (Tribhānu); of him; of His (Lord Kṛṣṇa's); of His; of Indra; of it; of Kṛti; of Kṛśāśva; of Kṛṣṇa; of Lord Brahmā; of Lord Kṛṣṇa; of Lord Śrī Kṛṣṇa; of Lord Ṛṣabhadeva; of Mahārāja Hariścandra; of Marutta; of Pṛthu; of Rambha; of such offenders; of that; of the virāṭ-puruṣa; of the advancing devotee; of the body of my husband; of the conditioned soul; of the cosmic manifestation; of the creation; of the devotee; of the entire cosmic manifestation; of the gigantic form; of the human beings; of the King; of the living being; of the living entities who have accepted material bodies; of the living entity; of the Lord; of the Lord, Śrī Caitanya Mahāprabhu; of the lust; of the manifested universes; of the material world; of the people in general; of the person; of the Personality of Godhead; of the possessor; of the serpent (Kāliya); of the Supreme Lord; of the Supreme Personality of Godhead; of the universal form; of the universal form of the Lord; of the universe; of the world; of this (Ajāmila); of this (material world); of this (Rādhā-kuṇḍa); of this (the universe); of this brahmacārī Vāmana; of this; of this body; of this child; of this cosmic manifestation; of this creation; of this earth; of this King; of this man; of this manifested cosmos or of anything material or visible; of this material world; of this one; of this person; of this tree; of this universe; of this Vāmanadeva; of this world; of your son; of your son Kṛṣṇa; one's; this; to him (the dead boy); to the living entity; unto Prahlāda; upon him.
—of it; parantapaplugin-autotooltip__small plugin-autotooltip_bigparantapa

O Arjuna, subduer of the enemies; O chastiser of the enemies; O chastiser of the enemy; O conquerer of enemies; O conquerer of the enemies; O great one; O killer of the enemies; O King; O King, who can subdue your enemies; O Mahārāja Parīkṣit, chastiser of enemies; O mighty-armed one; O subduer of the enemies; O subduer of the enemy.
—O killer of the enemies; aprāpyaplugin-autotooltip__small plugin-autotooltip_bigaprāpya

being unable to measure; failing; not achieving the goal; without achieving; without obtaining.
—without obtaining; māmplugin-autotooltip__small plugin-autotooltip_bigmām

about Me; at me; attains me; from me; Me (Kṛṣṇa); Me (Lord Kṛṣṇa); me (the earth); Me (the Supreme Lord); me (Vasiṣṭha); me; Me, the Supreme Personality of Godhead; My direction; Myself; of myself; to Me; unto me; upon me.
—Me; nivartanteplugin-autotooltip__small plugin-autotooltip_bignivartante

come back; comes back; have come back; return.
—come back; mṛtyuplugin-autotooltip__small plugin-autotooltip_bigmrtyu

death; of death; that; untimely death; while dying.
—death; saṁsāraplugin-autotooltip__small plugin-autotooltip_bigsaṁsāra

all the world; conditioned life; for the essence of enjoyment (rāsa-līlā); in material existence; in the material world; material bondage; material existence; material life; of material existence; of material life; of miserable conditions; of repeated birth and death; of this conditioned life; the bondage of material existence; the bondage to material existence; the conditioned life in material existence; the material creation; the material existence; the material world; the whole world.
—material existence; vartmaniplugin-autotooltip__small plugin-autotooltip_bigvartmani

on the path; on the path of.
—on the path of. 

Translation

Those who are not faithful on the path of devotional service cannot attain Me, O conqueror of foes, but return to birth and death in this material world. 

Purport

The faithless cannot accomplish this process of devotional service; that is the purport of this verse. Faith is created by association with devotees. Unfortunate people, even after hearing all the evidence of Vedic literature from great personalities, still have no faith in God. They are hesitant and cannot stay fixed in the devotional service of the Lord. Thus faith is a most important factor for progress in Kṛṣṇa consciousness. In the Caitanya-caritāmṛta it is said that one should have complete conviction that simply by serving the Supreme Lord Śrī Kṛṣṇa he can achieve all perfection. That is called real faith. In the Śrīmad-Bhāgavatam (3.4.12)plugin-autotooltip__small plugin-autotooltip_bigŚrīmad Bhāgavatam 3.4.12

O honest one, your present life is the last and the supermost because in this term of life you have been awarded My ultimate favor. Now you can go to My transcendental abode, Vaikuṇṭha, by leaving this universe of conditioned living entities. Your visit to Me in this lonely place because of your pure and unflinching devotional service is a great boon for you.
it is stated that by giving water to the root of a tree, its branches, twigs and leaves become satisfied, and by supplying food to the stomach all the senses of the body become satisfied, and, similarly, by engaging in the transcendental service of the Supreme Lord, all the demigods and all the living entities automatically become satisfied. 

After reading Bhagavad-gītā one should promptly come to the conclusion of Bhagavad-gītā: one should give up all other engagements and adopt the service of the Supreme Lord, Kṛṣṇa, the Personality of Godhead. If one is convinced of this philosophy of life, that is faith. Now the development of that faith is the process of Kṛṣṇa consciousness. 

There are three divisions of Kṛṣṇa conscious men. In the third class are those who have no faith. If they are engaged in devotional service officially, for some ulterior purpose, they cannot achieve the highest perfectional stage. Most probably they will slip, after some time. They may become engaged, but because they haven’t complete conviction and faith, it is very difficult for them to continue in Kṛṣṇa consciousness. We have practical experience in discharging our missionary activity that some people come and apply themselves to the Kṛṣṇa consciousness with some hidden motive, and as soon as they are economically a little well-situated, they give up this process and take to their old ways again. It is only by faith that one can advance in Kṛṣṇa consciousness. As far as the development of faith is concerned, one who is well versed in the literatures of devotional service and has attained the stage of firm faith is called a first-class person in Kṛṣṇa consciousness. And in the second class are those who are not very advanced in understanding the devotional scriptures but who automatically have firm faith that Kṛṣṇa bhakti or service to Kṛṣṇa is the best course and so in good faith have taken it up. Thus they are superior to the third class who have neither perfect knowledge of the scriptures nor good faith but by association and simplicity are trying to follow. The third-class person in Kṛṣṇa consciousness may fall down, but when one is in the second class or first class, he does not fall down. One in the first class will surely make progress and achieve the result at the end. As far as the third-class person in Kṛṣṇa consciousness is concerned, although he has faith in the conviction that devotional service to Kṛṣṇa is very good, he has no knowledge of Kṛṣṇa through the scriptures like Śrīmad-Bhāgavatam and Bhagavad-gītā. Sometimes these third-class persons in Kṛṣṇa consciousness have some tendency toward karma-yoga and jñāna-yoga, and sometimes they are disturbed, but as soon as the infection of karma-yoga or jñāna-yoga is vanquished, they become second-class or first-class persons in Kṛṣṇa consciousness. Faith in Kṛṣṇa is also divided into three stages and described in Śrīmad-Bhāgavatam. First-class attachment, second-class attachment, and third-class attachment are also explained in Śrīmad-Bhāgavatam in the Eleventh Canto. Those who have no faith even after hearing about Kṛṣṇa and the excellence of devotional service, who think that it is simply eulogy, find the path very difficult, even if they are supposedly engaged in devotional service. For them there is very little hope in gaining perfection. Thus faith is very important in the discharge of devotional service.