Help thyself: then everyone will help thee too. Principle of Christian charity.
Master-morality and Slave-morality.
Learning from one's enemies is the best way to love them, for it puts one into a grateful mood toward them.
That which does not destroy, strengthens.
Let thy virtue be too high for the familiarity of names, and if thou must speak of it, be not ashamed to stammer about it.
One who is unassuming in dealing with people exhibits his arrogance all the more strongly in dealing with things (city, state, society, age, mankind). That is his revenge.