Robert A. Heinlein vs. Mark Twain

"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…"

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

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

"He gave up and went back to loafing, found that he could sleep all right in the afternoons but that the practice kept him awake at night."

"As for population, every major shortcoming of our native planet could be traced to one cause: too many people, not enough planet."

"When you haven’t data, guessing is illogical."

"Luck is a bonus that follows careful planning—it’s never free."

"Don, have you been dealing with a booklegger?"

"“The trouble with you youngsters,” Joe said, “is that if you can’t understand a thing right off, you think it can’t be true. The trouble with your elders is,…"

"Apparently she believes she is safe. Evil is essentially stupid, Joe; despite her brilliance, she believes what she wishes to believe. Or it may be that she …"

"Widows are far better than brides. They don't tell, they won't yell, they don't swell, they rarely smell, and they're grateful as hell."

"Pacifism is a shifty doctrine under which a man accepts the benefits of the social group without being willing to pay - and claims a halo for his dishonesty"

"As Thorby learned to use his mind, he found that he liked to; he developed an insatiable appetite for the printed page."

"Pop, who maintained that a wise man could not be insulted, since truth could not insult and untruth was not worthy of notice."

"Anyone who considers protocol unimportant has never dealt with a cat."

"The future is better than the past. Despite the crepehangers, romanticists, and anti-intellectuals, the world steadily grows better because the human mind, a…"

"Horses can manufacture more horses and that is one trick that tractors have never learned."

"I believe that almost all politicians are honest. For every bribed alderman there are hundreds of politicians, low paid or not paid at all, doing their level…"

"But as grandpop always said, there are just three ways to get ahead; sweat and genius, getting born into the right family, or marrying into it."

"Since when did a mathematician need any tools but his own head? Pythagoras had done well enough with a stick and a stretch of sand."