One who does good is never overcome by evil

(Kadamba Kanana Swami, 09 November 2014, Mayapur, India, Srimad Bhagavatam 6.1.19) 

We have seen cases where devotees were murdered. I know of a devotee who was murdered whilst chanting japa; it happened in South Africa. Everyone was stunned because this was evil. I mean, this was a devotee. We had a big gathering for the departure of that devotee and we discussed it in great depth. Many senior vaisnavas came for that occasion and discussed and finally, the conclusion was that sometimes it is not the body that is protected by Krsna but it is the soul that is protected by Krsna. Therefore this statement of the Bhagavad-gita (6.40) certainly applies at all times,

na hi kalyana-krt kascid
durgatim tata gacchati, 

A vaisnava is never overcome by evil; it is not possible even though it may appear like that. The soul is always protected and the soul will always attain the most auspicious destination!

So in this way, we can see that one who is taking shelter of Krsna, even when a little service is performed, is making so much advancement and one is immediately receiving the protection of Krsna. That protection of Krsna is very great for such a devotee. Even if mistakes are made, still he is not doomed but rather he is saved from doom. Soon thereafter, the devotee will attain the ultimate goal of life because Krsna will continue to make further arrangements for purification.

Therefore, once we have started this process, once we are on this path, then surely we will continue and continue, and the only thing that can temporary delay our progress is the result of vaisnava aparadha. That temporary delay can be for a long time, just like Daksa who had to suffer for a kalpa with the head of a goat. A kalpa is quite a long time. So in that way, vaisnava aparadha is the one thing that we must avoid and nama aparadha also. Then we can progress very nicely, automatically on this path of pure devotional service!