Learning is more effective when it is an active rather than a passive process.

If you want truly to understand something, try to change it.

No research without action, no action without research.

A successful individual typically sets his next goal somewhat, but not too much, above his last achievement.

There is nothing so practical as a good theory.

Experience alone does not create knowledge.

When we are young we are like a flowing river - and then we freeze.

Social action, just like physical action, is steered by perception.

If you want to learn about an organization, try to change it.

Every psychological event depends upon the state of the person and at the same time on the environment, although their relative importance is different in different cases

A successful individual typically sets his next goal somewhat but not too much above his last achievement. In this way he steadily raises his level of aspiration.

No woman wants to be in submission to a man who isn't in submission to God!

No moment is more valuable than this moment because no moment is alive outside this moment any moment other than this moment is either dead or hasn’t born yet!

I told him, though, that he better be good to you. When you came along, I said I'd share you, but I told him to remember that you're my sister. I loved you first.

I think all of us who have been in Afghanistan on the ground multiple times know that what we're doing there on the ground is just not sustainable.

My parents paid me small amounts for cleaning my room or cleaning the dishes and stuff, but I never really had a real job before I started on my professional tennis career.

The Vice Presidency isn't worth a pitcher of warm spit.

Interesting verbs are seldom very interesting.

A perfect peace is not possible; it doesn't exist.

I think one of my greatest gifts is leading worship.

Men do not fight for flag or country, for the Marine Corps or glory or any other abstraction. They fight for one another. And if you came through this ordeal, you would age with dignity.