He only moves toward the perfection of his art whose criticism surpasses his achievement.

No one has ever achieved anything significant without a chorus of critics standing on the sidelines explaining why it can't be done.

I want no criticism of America at my table. The Americans criticize themselves more than enough.

Criticism may not be agreeable but it is necessary. It fulfils the same function as pain in the human body. It calls attention to an unhealthy state of things.

Criticism in the body politic is like pain in the human body. It is not pleasant, but where would the body be without it?

Religion and law try to escape from criticism, religion by saying that it is divine and law by showing that it is powerful.