We have to work sincerely and because Krishna is in everyone's heart, there will be no difficulty to have the necessary facilities. — Letter to Satsvarupa, 14th Sep, 1969.
Krishna is present fully in His holy name and this is realized by the humility and sincerity in our chanting.
If someone tries to love someone, they are very sincere because sincerity is one aspect of love. So if we are trying to love Krishna, we should pray – Krishna, I want to do my japa properly, sincerely. Please help me.
Sincerity is our greatest guide. What is sincerity? Sincerity means trying with all our energy, thoughts and love to please our spiritual master.
Sincerity in sadhana and eagerness to serve is the basis of one’s relationship with the spiritual master.
The Personality of Godhead may not be present before one's eyes, but if one is sincere in wanting such guidance, the Lord will send a bona fide person who can guide one properly back home, back to Godhead.