"In teaching there can be too much emphasis on certainty and a proper appreciation of uncertainty is to be encouraged."

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Never, in all of the seventy billion humans who have walked this planet since the beginning of time has there been anyone exactly like you. Never, until the end of time, will there be another such as you. You have shown no knowledge or appreciation of your uniqueness. Yet, you are the rarest thing in the world.

— Og Mandino