From Wikipedia:

William James (January 11, 1842 – August 26, 1910) was a pioneering American psychologist and philosopher who was trained as a physician. He wrote influential books on the young science of psychology, educational psychology, psychology of religious experience and mysticism, and on the philosophy of pragmatism. He was the brother of novelist Henry James and of diarist Alice James. In the summer of 1878, James married Alice Gibbens.

Quotes:

The greatest discovery of any generation is that a human can alter his life by altering his attitude.

If you can change your mind, you can change your life.

The art of being wise is knowing what to overlook.

Whenever two people meet, there are really six people present. There is each man as he sees himself, each man as the other person sees him, and each man as he really is.

We don’t laugh because we’re happy, we’re happy because we laugh.

Action may not always bring happiness, but there is no happiness without action.

“Nothing is so fatiguing as the eternal hanging on of an uncompleted task”

Seek out that particular mental attribute which makes you feel most deeply and vitally alive, along with which comes the inner voice which says, ‘This is the real me,’ and when you have found that attitude, follow it.

Act as if what you do makes a difference. It does.

The deepest principle in human nature is the craving to be appreciated.

Our view of the world is truly shaped by what we decide to hear.