See thou character.  Give they thoughts on tongue,

Nor any unproportion'd thought his act.

Be thou familiar, but by no means vulgar:

The friends thou hast, and their adoption tired,

Grappled them to thy soul with hoops of steel;

But do not dully thy palm with entertainment

Of each new-hatch'd, unfledg'd comrade.  Beware

Of entrance to a quarrel: But being in,

Bear't that th' opposed ma beware of thee.

Give every man thy ear, but few thy voice:

Take each man's censure, but reserve thy judgement.

Costly thy habits as thy purse can buy,

But not express'd in fancy: rich, not gaudy;

For the apparel oft proclaims the man.

Neither borrower nor a lender be;

For loan oft loses itself and friend,

And borrowing dulls the edge of husbandry.

This above all: to thine own self be true;

And it must follow, as night the day,

Thou cans't be false to any man.

 

-Shakespeare (Hamlet)