Males are conservative about sex, especially those who think they are not. - Robert A. Heinlein

The more you love, the more you can love — and the more intensely you love. Nor is there any limit on how many you can love. If a person had time enough, he could love all of that majority who are decent and just.

Heinlein's Rules for Writers

Rule One: You Must Write
Rule Two: Finish What Your Start
Rule Three: You Must Refrain From Rewriting, Except to Editorial Order
Rule Four: You Must Put Your Story on the Market
Rule Five: You Must Keep it on the Market until it has Sold

There are three schools of magic. One: State a tautology, then ring the changes on its corollaries; that’s philosophy. Two: Record many facts. Try to see a pattern. Then make a wrong guess at the next fact; that’s science. Three: Awareness that you live in a malevolent universe controlled by Murphy’s Law, sometimes offset in part by Brewster’s Factor: that’s engineering.