The time has come for honest men to denounce false teachers and attack false gods.

We must return to nature and nature's god.

In the span of my own lifetime I observed such wondrous progress in plant evolution that I look forward optimistically to a healthy, happy world as soon as its children are taught the principles of simple and rational living.

As a scientist I cannot help feeling that all religions are on a tottering foundation. None is perfect or inspired. As for their prophets, there are as many today as ever before, only now science refuses to let them overstep the bounds of common sense.

Less than fifteen per cent of the people do any original thinking on any subject. The greatest torture in the world for most people is to think.

The time has come for honest men to denounce false teachers and attack false gods.

The secret of improved plant breeding, apart from scientific knowledge, is love.