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.
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.