Be not angry that you cannot make others as you wish them to be, since you cannot make yourself as you wish to be. – Thomas à Kempis, Imitation of Christ, c.1420
Everything perfect in its kind has to transcend its own kind, it must become something different and incomparable. In some notes the nightingale is still a bird; then it rises above its class and seems to suggest to every winged creature what singing is truly like. – Johann von Goethe