Robert A. Heinlein - Time Enough for Love (1973)

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If men were the automatons that behaviorists claim they are, the behaviorist psychologists could not have invented the amazing nonsense called 'behaviorist psychology.'

Robert A. Heinlein

The second best thing about space travel is that the distances involved make war very difficult, usually impractical, and almost always unnecessary. This is probably a loss for most people, since war is our race's most popular diversion, one which gives purpose and color to dull and stupid lives. But it is a great boon to the intelligent man who fights only when he must-never for sport.

Robert A. Heinlein

God split himself into a myriad parts that he might have friends. This may not be true, but it sounds good, and is no sillier than any other theology.

Robert A. Heinlein

In handling a stinging insect, move very slowly.

Robert A. Heinlein

Oh, I have strong opinions, but a thousand reasoned opinions are never equal to one case of diving in and finding out.

Robert A. Heinlein

Permit me to say, speaking from experience, all theories are empty.

Robert A. Heinlein

In a family argument, if it turns out you are right, apologize at once.

Robert A. Heinlein