Despite what your elementary school teachers told you, it is not unreasonable to believe you have a purpose different from that which you have been assigned, or even can be assigned. What is unreasonable is to expect anyone else to believe you. It is unreasonable to expect others to be reasonable.
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Last week I saw a great quote attributed to Franklin D. Roosevelt: “You should never underestimate the man who overestimates himself.” Whether he said it or not, it certainly makes sense coming from someone able to say “We have nothing to fear but fear itself.”