Here are a couple of very good quotes, which I have always liked very much.
I respect faith, but doubt is what gets you an education.
—Wilson Mizner
The pessimist complains about the wind; the optimist expects it to change; the realist adjusts the sails.
—William Arthur Ward
The greatest obstacle to discovery is not ignorance; it is the illusion of knowledge.
—Daniel J. Boorstin
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