Both optimists and pessimists contribute to our society. The optimist invents the airplane and the pessimist the parachute.

Both optimists and pessimists contribute to our society. The optimist invents the airplane and the pessimist the parachute.

If there is no struggle there is no progress.

If there is no struggle there is no progress.

Disapproval is a very important factor in all progress. There has really never been any progress without it.

Disapproval is a very important factor in all progress. There has really never been any progress without it.

Being right too soon is socially unacceptable.

Being right too soon is socially unacceptable.

Those families, you know, are our upper crust, not upper ten
thousand.

Those families, you know, are our upper crust, not upper ten
thousand.

Any good practical philosophy must start out with the recognition of our having a body.

Any good practical philosophy must start out with the recognition of our having a body.

Experience proves that those are oftenest abused who can be abused with the greatest impunity. Men are whipped oftenest who read more

Experience proves that those are oftenest abused who can be abused with the greatest impunity. Men are whipped oftenest who are whipped easiest.

The strongest man upon Earth is he who stands most alone.

The strongest man upon Earth is he who stands most alone.

Every politician, clergyman, educator, or physician, in short, anyone dealing with human individuals, is bound to make grave mistakes if read more

Every politician, clergyman, educator, or physician, in short, anyone dealing with human individuals, is bound to make grave mistakes if he ignores these two great truths of population zoology: (1) no two individuals are alike, and (2) both environment and genetic endowment make a contribution to nearly every trait.