Robert A. Heinlein said this quote

“ It is almost impossible to shake of one's earliest training. Duke, can you get it through your skull that had you been brought up by Martians, you would have the same attitude toward eating and being eaten as Mike has. ”

Famous Quotes of Robert A. Heinlein

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Love is that condition in which the happiness of another person is essential to your own.

~ Robert A. Heinlein

Don't explain computers to laymen. Simpler to explain sex to a virgin.

~ Robert A. Heinlein

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 - in fact, they are almost incompatible; one emotion hardly leaves room for the other.

~ Robert A. Heinlein

May you live as long as you wish and love as long as you live.

~ Robert A. Heinlein