Act 1, Scene 3

Give thy thoughts no tongue, Nor any unproportion'd thought his act. 
Be thou familiar, but by no means vulgar;
Those friends thou hast, and their adoption tried,
Grapple them unto thy soul with hoops of steel,
But do not dull thy palm with entertainment
Of each new-hatch'd, unfledg'd courage. Beware
Of entrance to a quarrel, but being in,
Bear't that th'opposed may beware of thee.
Give every man thy ear, but few thy voice;
Take each man's censure, but reserve thy judgement.
Costly thy habit as thy purse can buy,
But not express'd in fancy; rich, not gaudy;
For the apparel oft proclaims the man,
And they in France of the best rank and station
Are of a most select and generous chief in that.
Neither a borrower nor a lender be,
For loan oft loses both itself and friend,
And borrowing dulls the edge of husbandry.
This above all: to thine own self be true,
And it must follow as the night the day
Thou canst not then be false to any man.
Farewell, my blessing season this in thee.