Related:

• Beware of entrance to a quarrel; but being in, bear it that the opposer may beware of thee.
  -- William Shakespeare...
• The better part of valour is discretion; in the which better part I have saved my life.
  -- William Shakespeare (1564-1616), King Henry IV -- Act v, Sc. 4...
• 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....
• That he is mad, 't is true: 't is true 't is pity; And pity 't is 't is true.
  -- William Shakespeare (1564-1616), Hamlet -- Act ii, Sc. 2...
• This above all: to thine own self be true. -- Polonius in _Hamlet_ by William Shakespeare
• False as dicers' oaths. -- William Shakespeare (1564-1616), Hamlet -- Act iii, Sc. 4
• Framed to make women false. -- William Shakespeare (1564-1616), Othello -- Act i, Sc. 3
• This is the very false gallop of verses. -- William Shakespeare (1564-1616), As You Like It -- Act iii, Sc.
  2...
• Rightly to be great Is not to stir without great argument, But greatly to find quarrel in a straw When honour 's at the stake.
  -- William Shakespeare (1564-1616), Hamlet -- Act iv, Sc. 4...