Robert A. Heinlein

When one teaches, two learn.

Robert A. Heinlein

If a grasshopper tries to fight a lawnmower, one may admire his courage but not his judgement.

Robert A. Heinlein

Ninety percent of all human wisdom is the ability to mind your own business.

Robert A. Heinlein

A child’s life is like a piece of paper on which every person leaves a mark.

Robert A. Heinlein

A critic is a man who creates nothing and thereby feels qualified to judge the work of creative men. There is logic in this; he is unbiased, he hates all creative people equally.

Robert A. Heinlein

A generation which ignores history has no past and no future.

Robert A. Heinlein

Ability is a wonderful thing, but its value is greatly enhanced by dependability. Ability implies repeatability and accountability.

Robert A. Heinlein

Any group is weaker than a man alone unless they are perfectly trained to work together.

Robert A. Heinlein

Anything free costs twice as much in the long run or turns out worthless.

Robert A. Heinlein

Anything which is physically possible can be made financially possible, if the people of a state desire it.

Robert A. Heinlein