It is the part of a fool to give advice to others and not himself to be on his guard

A man who would give advice without understanding is a fool.

Those who give bad advice to the prudent, both lose their pains and are laughed to scorn. [Lat., Consilia qui dant prava cautis hominibus, Et perdunt operam et deridentur tupiter.]

There are no foolish questions and no man becomes a fool until he has stopped asking questions.

Things are not always as they seem; the first appearance deceives many.

An alliance with a powerful person is never safe.