Shakespeare.

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Be yourself, simple, honest, and unpretending, and you will enjoy through life the respect and love of friends.

Sherman.

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Do not trouble yourself much to get new things, whether clothes or friends. Turn the old; return to them.

Thoreau.

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A man can scarce allege his own merits with modesty, much less extol them; a man cannot sometimes brook to supplicate or beg; and a number of the like; but all these things are graceful in a friend's mouth which are blushing in a man's own.

Bacon.