Prudence Affairs are easier of entrance than of exit; and it is but common prudence to see our way out before we venture in. - Aesop
Pain and sorrow and misery have a right to our assistance: compassion puts us in mind of the debt, and that we owe it to ourselves as well as to the distressed. - Joseph Butler
A system of morality which is based on relative emotional values is a mere illusion, a thoroughly vulgar conception which has nothing sound in it and nothing true. - Socrates