"Nothing was ever in any man that is not in you; no man ever had more spiritual or mental power than you can attain, or did greater things than you can accomplish. You can become what you want to be."

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First, In showing in how to avoid attempting impossibilities. Second, In securing us from important mistakes in attempting what is, in itself possible, by means either inadequate or actually opposed to the end in view. Thirdly, In enabling us to accomplish our ends in the easiest, shortest, most economical, and most effectual manner. Fourth, In inducing us to attempt, and enabling us to accomplish, object which, but for such knowledge, we should never have thought of understanding. On the ways that a knowledge of the order of nature can be of use.

— John Herschel