A failure remains a failure, regardless of how close to success one has actually come.

Just the right amount is as good as more than enough: there is no value in excess.

The hint, suggestion etc. can be understood without further explanation.

One's lack of intelligence may be judged by one's actions.

plural of is-a

A person's good actions, rather than outward appeal, define his or her handsomeness in the eyes of others.

(idiomatic) I don't know; I have no idea.

Doing something different from one's routine is as refreshing as taking a break from work altogether.