Perpetual devotion to what a man calls his business, is only to be sustained by perpetual neglect of many other things. Robert Louis Stevenson
The assumption that individuals act objectively in accordance with purely mathematical dictates to maximize their gain or utility cannot be sustained by empirical observation. Richard Arnold Epstein
A creative life cannot be sustained by approval any more than it can be destroyed by criticism. Will Self
All my life with all my heart I wanted the union of Crete and Greece. I wanted it to be sustained by profound mutual affection. I swear that was my only desire.... Greece will never see me again. Eleftherios Venizelos
Family life is too intimate to be preserved by the spirit of justice. It can be sustained by a spirit of love which goes beyond justice. Reinhold Niebuhr
When anyone starts out to do something creative - especially if it seems a little unusual - they seek approval, often from those least inclined to give it. But a creative life cannot be sustained by approval, any more than it can be destroyed by criticism - you learn this as you go on. Will Self