Criticism….

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.

– Winston S Churchill

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Widespread…

Widespread intellectual and moral docility may be convenient for leaders in the short term, but it is suicidal for nations in the long term. One of the criteria for national leadership should, therefore, be a talent for understanding, encouraging and making constructive use of vigorous criticism.

– Carl Sagan