An injury is much sooner forgotten than an insult.

-Chesterfield, Philip Dormer Stanhope, 4th Earl of
  Letter to his son, 9 Oct.

Lord, make me an instrument of Your peace. Where there is hatred, let me sow love; Where there is injury, pardon; Where there is doubt, faith; Where there is despair, hope; Where there is darkness, light; Where there is sadness, joy. O divine Master, grant that I may not so much seek To be consoled as to console; To be understood as to understand; To be loved as to love. For it is in giving that we receive; It is in pardoning that we are pardoned; And it is in dying that we are born to eternal life.

-Franklin, Benjamin
Attributed prayer, traditionally known as the'Prayer of St Francis'.

If a man have a tent made in linen of which the apertures haveall beenstopped up, and it be twelve braccia across and twelve in depth, he will be able to throw himself down from any great height without sustaining injury.

-Leonardo daVinci
Description of a parachute. Notebooks. Quoted in Vincent Cronin The Flowering of the Renaissance (1969).

Everyone who receives the protection of society owes a return for the benefit, and the fact of living in a society renders it indispensable that each should be bound to observe a certain line of conduct towards the rest. That conduct consists†in each person bearing his share of the labours and sacrifices incurred for defending the society or its members from injuryand molestation.

-Mill,John Stuart
  On Liberty.

The essential characteristic of philosophy, which makes it a study distinct from science, is criticism. It examines critically the principles employed in science and in daily life; it searches out any inconsistencies there may be in these principles, and it onlyaccepts them when, as the result of a critical inquiry, there is no reason for rejecting them.

-Russell, Bertrand Arthur William Russell, 3rd Earl
  The Problems of Philosophy, ch.14.