He who striveth, having commenced anything, till it is completed, who never wasteth his time, and who hath his soul under control, is regarded wise. They that are wise, O bull of the Bharata race, always delight in honest deeds, do what tendeth to their happiness and prosperity, and never sneer at what is good. He who exulteth not at honours, and grieveth not at slights, and remaineth cool and unagitated like a lake in the course of Ganga, is reckoned as wise.

In plain words: A wise person finishes what they start, does not waste time, and controls themselves. They enjoy honest work and never mock what is good. They don't get puffed up by praise or upset by insults, but stay calm like a deep lake in the Ganga river.