polonious

Be thou familiar, but by no means vulgar.
Those friends thou hast, and their adoption tried,
Grapple them to thy soul with hoops of steel;
But do not dull thy palm with entertainment
Of each new-hatch’d, unfledged comrade. Beware
Of entrance to a quarrel, but being in,
Bear’t that the opposed may beware of thee.
Give every man thy ear, but few thy voice;
Take each man’s censure, but reserve thy judgment.
—  Shakespeare, Hamlet.