A person's genetic endowment, a product of the evolution of the species, is said to explain part of the workings of his mind and his personal history the rest.

A failure is not always a mistake, it may simply be the best one can do under the circumstances. The real mistake is to stop trying.

A person who has been punished is not thereby simply less inclined to behave in a given way; at best, he learns how to avoid punishment.

Give me a child and I'll shape him into anything.

The major difference between rats and people is that rats learn from experience.

Education is what survives when what has been learned has been forgotten.

Behavior is determined by its consequences.

That's all teaching is; arranging contingencies which bring changes in behavior.

Behavior is shaped and maintained by its consequences

The way positive reinforcement is carried out is more important than the amount.

It is not a question of starting. The start has been made. It's a question of what's to be done from now on.

Why do people assume? If I hate you, I'll tell you. In this case, it's not hate. It's hurt. I'll lick my wounds, which only oozed because I gave a damn, and be over it before the sun rises.

Everything that glitters ain't gold.

Let the enemy fall by their swords. Words not worth reading die their own death. But our Words will be Told!

Words are the money of fools.

If you go through life and actually get to find out the thing you want to do, you're very lucky.

There are no lessons so useful as those learned in the school of affliction.

I was pretty far gone, but not so far gone that I thought anyone with half a toehold in reality would think what we were doing was a good idea.

Someday. That's a dangerous word. It's really just a code for 'never'.

It seems to me that philosophers should be more relaxed about whether or not some form of materialism is true.

True friends don't say good-bye, they just take extended leaves of absences from each other.