Quotes about managers principles

Speak well of absent people; fairness is a reputation builder - Dale Carnegie
At its core, this is about integrity when no one's watching, defending people's reputations when they can't defend themselves.

Wise advice on managers

Give the audience a good reputation to live up to; people rise to expectation - Dale Carnegie
The core idea is that by assigning a positive label or reputation to someone, you create a powerful psychological incentive for them to embody that very trait.