Learn, compare, collect the facts!

Never think that you already know all. However highly you are appraised, always have the courage to say to yourself-I am ignorant.

Don't become a mere recorder of facts, but try to penetrate the mystery of their origin.

When the dog is repeatedly teased with the sight of objects inducing salivary secretion from a distance, the reaction of the salivary glands grows weaker and weaker and finally drops to zero.

Science demands from a man all his life. If you had two lives that would not be enough for you. Be passionate in your work and in your searching.

While you are experimenting, do not remain content with the surface of things.

Men are apt to be much more influenced by words than by the actual facts of the surrounding reality

Perfect as the wing of a bird may be, it will never enable the bird to fly if unsupported by the air. Facts are the air of science. Without them a man of science can never rise.

Appetite, craving for food, is a constant and powerful stimulator of the gastric glands.

It is still open to question whether psychology is a natural science, or whether it can be regarded as a science at all.

Perfect as the wing of a bird may be, it will never enable the bird to fly.

A man feared that he might find an assassin

Go back to bed America, your government is in control again. Go back to bed America... you are free to do as we tell you... you are free to do as we tell you.

We may seem great in an employment below our worth, but we very often look little in one that is too big for us.

Many writers are neither spirit nor wine, but rather spirits- of-wine: they can catch fire, and then they give off heat.

The warfare between the unaroused male and female is constant and ferocious. Each blames the other for his loss of soul.

You're not meant to do what's easy, you're meant to challenge yourself.

The body can do incredible things as long as the mind supports it.

I have an education, I went to college, you know?

Stupidity cannot be cured with money, or through education, or by legislation.

Be honest with yourself, and you will find the motivation to do what you advise others to do.