One person may be or may not be inclined to accept Krishna Consciousness, but that doesn't matter, but if we try our best to make one person Krishna Conscious, then our duty is carried nicely. That is recognized by Krishna. In Sanskrit it is said Yatne Krite Yadina Sidehati Kotra Dosah. That means, in spite of our best efforts, if things do not come successful, then there is no fault on our side. That should be the principle of our preaching, we shall try our best to convince others in Krishna Consciousness, and Krishna will be pleased, that is our gain.
Letter to Rupanuga, 15 October, 1968