Disturbance of mind is due to our ignorance.
Dhīra means that one who is undisturbed in mind. And our disturbance of the mind is due to our ignorance. Suppose I want to go somewhere. Now I am in the station. Actually, it so happened when I came to New York first from India. I was to be dispatched to Butler by the bus station, but I was a new man. I did not know the rules and regulation. Of course, somebody was guiding me. Still, I was very much in disturbed condition, how to get on the bus, how to get the ticket, how… All these. So disturbance of mind is due to our ignorance.