Robert A. Heinlein
“Yield to temptation; it may not pass your way again.”
“Progress isn't made by early risers. It's made by lazy men trying to find easier ways to do something.”
“One man's magic is another man's engineering.”
“Never underestimate the power of human stupidity.”
“Love is that condition in which the happiness of another person is essential to your own.”
“An armed society is a polite society.”
“There ain't no such thing as a free lunch.”
“Specialization is for insects.”