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 SaganEach of us is a tiny being, permitted to ride on the outermost skin of one of the smaller planets for a few dozen trips around the local star.
Carl Sagan