First, one has to preach the glories of the Holy Name of the Lord, and by their preaching to the others, their faith will actually also increase. “Yes, I want to take the Holy Name of the Lord, because I want to make Kṛṣṇa the goal of my life!” And then, such a person has faith that by receiving the Holy Name of the Lord, he’ll actually be able to attain Kṛṣṇa as the goal of his life.
MKV, Vol 8- Pg 18, Our Progress in Life is Gauged by Our Chanting- May 01, 2001-Moscow