The transcendental Personality of Godhead, Sri Govinda, is our eternal master. The word prabhu refers to one who is able to both punish and bestow mercy.

 The Supreme Lord is capable of doing and undoing anything. It is not a fact that the Lord only displays compassion; but He can also punish. The Lord incarnates to rectify those proud people who are averse to Him by punishing them. It is the nature of the compassionate to both punish and show clemency accordingly. But punishment is a display  of His indirect mercy, whereas clemency is a display of His direct mercy.
Conditioned living entities who are averse to the Lord or who act sinfully are fit objects for the Lord's punishment, and devotees inclined to Krishna's service are qualified for His direct mercy. Even weak-hearted but simple-minded humble practitioners of devotionals service are qualified for the Lord's compassion, whereas proud, crooked people are punishable because they cheat.