Bg. 18.68

य इदं परमं गुह्यं मद्भक्तेष्वभिधास्यति ।
भक्तिं मयि परां कृत्वा मामेवैष्यत्यसंशयः ॥६८॥

Text

ya idaṁ paramaṁ guhyaṁ
mad-bhakteṣv abhidhāsyati
bhaktiṁ mayi parāṁ kṛtvā
mām evaiṣyaty asaṁśayaḥ

Synonyms

yaḥplugin-autotooltip__small plugin-autotooltip_bigyah

who; a devotee who; a person; a person who; all those; any person who; any such master who; anyone (king or governor); anyone; anyone who; Bali Mahārāja; because; everything; he (who has); he; he person who; He who (Govinda); he who (Jahnu); He who (Lord Nārāyaṇa); He who (Lord Śrī Caitanya Mahāprabhu); he who (my so-called husband); he who (Somadatta); He who (the Lord); He who (the Personality of Godhead); He who (the Supreme Personality of Godhead); he who (Śunaḥśepha); he who; I who; it is He only; King Khaṭvāṅga who; Lord Rāmacandra who; Mahārāja Sagara who; on account of; one; one of the sons of Sagara Mahārāja; one which; one who (the Supreme Personality of Godhead); one who (Viśvāmitra); one who; one who is; person; such a person (as you); such a person; that; that is; that person; that Personality of Godhead who; that same person who; that which; the Lord who; the one; the one who; the person; the person who; the same Jaḍa Bharata who was formerly Mahārāja Bharata, the son of Mahārāja Ṛṣabhadeva; the same Rāhu; the Supreme Lord who; the Supreme Personality of Godhead; the Supreme Personality of Godhead who; the system; who; who are; who is; whoever; whom; you who; Your Lordship.
—anyone; idamplugin-autotooltip__small plugin-autotooltip_bigidam

all of this cosmic manifestation; all these; all these manifestations; all these phenomena; all these planets; all these things; all this; as it is; here; in their own measurement; in this material world; in this way; in this world; is this; like this; on this (as follows); on this (path); the cosmic manifestation is produced; the following; the following words; the universe rests; the whole; the whole universe; these; these words; this (Śrīmad-Bhāgavatam); this (all the land given to them); this (body); this (cosmic manifestation); this (creation); this (life); this (material body); this (material world); this (news); this (the body and senses); this (universe); this (world); this; this body; this body of Brahmā; this cosmic manifestation; this cosmic manifestation is created and maintained; this creation; this description of the characteristics of Vāmanadeva; this entire cosmic manifestation; this entire universe; this glorification; this incident; this lamentation; this manifestation; this material attachment; this material world; this phenomenal world; this philosophy of life; this prayer; this present form; this ultimate abode of the Supreme Personality of Godhead; this universe; this Vedic literature (Śrīmad-Bhāgavatam); this whole material world; this whole universe; this world; thus; whatever we can see; which we see.
—this; paramamplugin-autotooltip__small plugin-autotooltip_bigparamam

a supreme; divine; extreme; foremost; highest; is the supreme; most; supreme; the best (within the universe); the best; the Supreme; the ultimate; the ultimate goal; topmost; transcendental; ultimate; very; very great; very severe; with great.
—most; guhyamplugin-autotooltip__small plugin-autotooltip_bigguhyam

confidential; confidential duty; confidential topics; from His confidential knowledge; mysterious; secret; the most confidential; very confidential (because ordinary men cannot understand the activities of Kṛṣṇa); very confidential.
—confidential; matplugin-autotooltip__small plugin-autotooltip_bigmat

by me; for Me; from Me; having; Me; Mine; My; myself; of Me; possessing; than me; than Myself; to me; to Myself; under My; unto Me (Kṛṣṇa); unto Me.
—Mine; bhakteṣuplugin-autotooltip__small plugin-autotooltip_bigbhakteṣu

amongst devotees of; to the devotees; unto the devotees.
—amongst devotees of; abhidhāsyatiplugin-autotooltip__small plugin-autotooltip_bigabhidhāsyati

explains.
—explains; bhaktimplugin-autotooltip__small plugin-autotooltip_bigbhaktim

devotion; devotional service; love and faith in devotional service; service unto the Lord.
—devotional service; mayiplugin-autotooltip__small plugin-autotooltip_bigmayi

as I; at me; devoted to Me; I am; in Me; in me, in my water; in my (womb); Me; of Myself; on me; on My; to Me; towards Me; unto Me; unto Me, the Supreme Personality of Godhead; upon Me; when 1; when I; while I am living; within me.
—unto Me; parāmplugin-autotooltip__small plugin-autotooltip_bigparam

above; absolute; after; after the initiation; afterwards; and afterward; another; as long as that of Lord Brahmā; as the ultimate goal of life; best; better means; beyond; beyond material nature; beyond that; but; but afterwards; distant; elevation to the heavenly planets or becoming one by merging into Brahman; enemies; far superior things; final; further supreme; Godhead; great; greater; greatest; heavy; higher; highest; liberation; merely; more supreme; most glorious; only; only or ultimately; only this earth; other; other thing; others; perfect; perfectly; sublime; superior; superior life; supreme; supreme, transcendental; that much only; the actual transcendental position; the best; the foremost; the goal of life; the greatest; the highest; the most exalted; the only means; the supreme; the supreme abode; the supreme knowledge (by which one can attain devotional service); the Supreme Lord; the Supreme Person; the Supreme Personality of Godhead; the supreme whole; the transcendental world; the ultimate goal; to the transcendental spiritual kingdom; to the transcendental world; topmost; transcendence; transcendental; transcendental knowledge; transcendental to, beyond; transcendental world; ultimate; uncommon; under control; very great; very much; who are transcendental, beyond this material world; who is transcendental.
—transcendental; kṛtvāplugin-autotooltip__small plugin-autotooltip_bigkṛtvā

accepting; after doing; after making; after offering; after performing; after placing; by assumption of; considering such an ocean; doing; doing so; executing; expanding; having been taken by; having done; having installed; having misidentified; having placed; having put; having selected; having shown; keeping; keeping it; making; performing; placing; receiving properly; taking; thereafter doing; turned.
—having done; 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.
—unto Me; evaplugin-autotooltip__small plugin-autotooltip_bigeva

alone; also; also the word eva; although; as; as it is; as it were; as much as; as they are; at all; at that time; certainly; certainly,; certainty; completely; definitely; even; ever; exactly; exactly like; factually; Himself; immediately; in fact; in this way; indeed; it is all like that; just; just so; like; like that; like this; of course; on the very; only; quite; simply; so; surely; the word eva; they are; thus; truly; undoubtedly; very; without doubt.
—certainly; eṣyatiplugin-autotooltip__small plugin-autotooltip_bigeṣyati

comes; will achieve; will become; will return.
—comes; asaṁśayaḥplugin-autotooltip__small plugin-autotooltip_bigasaṁśayaḥ

beyond a doubt; without doubt.
—without doubt. 

Translation

For one who explains the supreme secret to the devotees, devotional service is guaranteed, and at the end he will come back to Me. 

Purport

Generally it is advised that Bhagavad-gītā be discussed amongst the devotees only, for those who are not devotees will neither understand Kṛṣṇa nor Bhagavad-gītā. Those who do not accept Kṛṣṇa as He is and Bhagavad-gītā as it is should not try to explain Bhagavad-gītā whimsically and become offenders. Bhagavad-gītā should be explained to persons who are ready to accept Kṛṣṇa as the Supreme Personality of Godhead. It is a subject matter for the devotees only and not for philosophical speculators. Anyone, however, who tries sincerely to present Bhagavad-gītā as it is will advance in devotional activities and reach the pure devotional state of life. As a result of such pure devotion, he is sure to go back home, back to Godhead.