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To criticize is to appreciate, to appropriate, to take intellectual possession, to establish in fine a relation with the criticized thing and to make it one's own.

In the End, we will remember not the words of our enemies, but the silence of our friends.

There is only one thing a philosopher can be relied upon to do, and that is to contradict other philosophers.

A wise man gets more use from his enemies than a fool from his friends

Don't find fault, find a remedy

To do just the opposite is also a form of imitation