One should learn how to cry for the Lord. One should learn this small technique, he should be very eager and actually cry to become engaged in some particular type of service, This is called 'laulyam' and such tears are the price for the highest perfection. If one develops this 'laulyam', or excessive eagerness for meeting and serving the Lord in a particular way, that is the price to enter into the kingdom of God. — The Nectar of Devotion, Page 83.
Krishna does not agree to award devotional service to merely anyone. Krishna can easily offer a person material happiness or even liberation, but He does not agree very easily to award a person engagement in his devotional service. Devotional service can in fact be attained only through the mercy of a pure devotee. — The Nectar of Devotion, Page 14.
Caitanya Mahaprabhu has recommended that everyone chant the Hare Krishna mantra just to cleanse the dust from the heart. If the dust of the heart is cleansed away, then one can actually understand the importance of the holy name.
Nectar of Devotion, Chapter 12,
As far as the conditioned soul is concerned, there is no wonder that he has some sinful activities in his past life, this should be admitted and confessed before the Lord. As soon as this is done, the Lord excuses the sincere devotee. But that does not mean that one should take advantage of the Lord's causeless mercy and expect to be excused over and over again while he commits the same sinful activities. – The Nectar of Devotion, Page 81.