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One is always considered mad, when one discovers something that others cannot grasp.

Let me be accurate in everything, for though you and I have seen some strange things together, you may at the first think that I, Van Helsing, am mad. That the many horrors and the so long strain on nerves has at the last turn my brain.

There is a pleasure in being mad which none but madmen know.

I get mad like anybody else does, but being able to laugh about getting mad is very healthy, and my kids know that.

I don't think you ever know in yourself whether you have gone mad.

I'm very much afraid of being mad - that's my one fear.

The brain is like a muscle. When it is in use we feel very good. Understanding is joyous.

I just really like learning. I have to keep using my brain; otherwise, I get depressed.

I don't get mad too much.