Prasidhyati means it flourishes. The cause is advanced. How? Utsāhāt. We should be very much enthusiastic: "Oh, Kṛṣṇa consciousness is so nice. We have heard about Kṛṣṇa consciousness so nice things. It is so beneficial for successful human mission, so I must have it. I must execute this Kṛṣṇa consciousness." This is called utsāhāt, to become energetic, not lethargic but energetic. So utsāhād dhairyāt. Dhairyāt means with patience. Suppose I have begun immediately. So if there are so many impediments, I am not immediately successful, oh, that does not matter. I must be patient.
Dhairyat means
Lectures
Bhagavad-gita As It Is Lectures
Dhairyāt means with patience. Suppose I have begun immediately. So if there are so many impediments, I am not immediately successful, oh, that does not matter. I must be patient.
Lecture on BG 4.19-22 -- New York, August 8, 1966: