You should often amuse yourself when you take a walk for recreation, in watching and taking note of the attitudes and actions of men as they talk and dispute, or laugh or come to blows with one another... noting these down with rapid strokes, in a little pocket-book which you ought always to carry with you.
Strive to preserve your health; and in this you will better succeed in proportion as you keep clear of the physicians, for their drugs are a kind of alchemy concerning which there are no fewer books than there are medicines.
The Book of the science of Mechanics must precede the Book of useful inventions.
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