Love is that condition in which the happiness of another person is essential to your own… Jealousy is a disease, love is a healthy condition. The immature mind often mistakes one for the other, or assumes that the greater the love, the greater the jealousy. – Robert A. Heinlein
The art of living does not consist in preserving and clinging to a particular mode of happiness, but in allowing happiness to change its form without being disappointed by the change; happiness, like a child, must be allowed to grow up. – Charles L. Morgan
That is to say, epic poetry has been invented many times and independently but, as the needs which prompted the invention have been broadly similar, so the invention itself has been. – Lascelles Abercrombie