The Pandavas were devotees, but at the same time, they were king. There was attachment. So therefore Krsna took away their everything - their kingdom, their wife, their position, their honor - test him, and still, they did not give up Krsna. Therefore they came out victorious. So Krsna sometimes tests His..., that how much one devotee is. He forcibly makes him renounced in order. That is Krsna's special favor.
Lecture on Srimad-Bhagavatam 1.13.11, Geneva, June 2, 1974