He has great tranquility of heart who cares neither for the praises nor the fault-finding of men.

The saying praises an inner steadiness that is not hostage to public opinion. To be equally unmoved by applause and blame is to locate one’s self-worth and moral compass internally rather than in the shifting judgments of others. The “tranquility of heart” it describes is not indifference to truth or accountability, but freedom from vanity and resentment—two emotions that make praise intoxicating and criticism corrosive. Read this way, the line aligns with a long tradition of moral reflection (Stoic and Christian alike) that treats equanimity as a mark of character: the person who acts from principle can accept feedback without being ruled by it.