Although the motive (of a devotee) might be impure, the Lord does not consider the motive; He is concerned with the service. However if a devotee has a particular motive, the Lord directly or indirectly knows it and therefore, He does not leave the devotee’s material desire unfulfilled. These are some of the special favours by the Lord to a devotee.
It is the causeless mercy of the Supreme Lord that He always tries to bring us back home, back to Godhead. God is liberated and He tries to make us liberated, but although He is constantly trying, we refuse to accept His instructions. Nonetheless, He has not become angry.
It is actually the Lord’s mercy that He takes the trouble to rectify our misbehaviour, although faithless persons criticize the Lord’s fatherly vigilance.
The occupational activities a man performs according to his own position are only so much useless labor if they do not provide attraction for the message of the Personality of Godhead.