Bad parents do not reproduce good children

A person who has talent, resolve, or moral strength will eventually succeed despite having been overlooked, injured, or defeated.

One cannot change one's nature, no matter how much time passes.

A person's perceived skill or competence is determined by their most recent success or failure.

It is better to selectively incorporate elements of other people's work rather than copying them wholesale.

Alternative form of all good things come to an end

(idiomatic, quasi-adjective) Unsuitable for anyone or anything; unfit for any purpose.

A command that another person leave, thereby impliedly having the door hit them on the buttocks as they pass through it.

Alternative form of nobody ever went broke underestimating the taste of the American people

Alternative form of nobody ever went broke underestimating the taste of the American people