The two operations of our understanding, intuition and deduction, on which alone we have said we must rely in the acquisition of knowledge.

We do not describe the world we see, we see the world we can describe.

Whenever anyone has offended me, I try to raise my soul so high that the offense cannot reach it.

De omnibus dubitandum

Divide each difficulty into as many parts as is feasible and necessary to resolve it.

Conquer yourself rather than the world.

The reading of all good books is like a conversation with the finest minds of past centuries.

The chief cause of human errors is to be found in the prejudices picked up in childhood.

Doubt is the origin of wisdom

The only thing we have power over in the universe is our own thoughts.

How can you be certain that your whole life is not a dream?

I learned to play the instruments of war, " he said, "and paint in blood.

Do not destroy anybody’s peace. You will find peace.

One thing I do believe is I'm a believer in the presence of God. I believe that God is close. Whether it's in joy, pain or personal failure, I believe that God is close. That much I feel in my life.

Yesterday, my son was out in the yard playing with his friend, and he hit his friend. I walked up to him, and I said, "Hey... We don't hit". He looked at me like, "Here's your sign, Dad".

All your life an unattainable ecstasy has hovered just beyond the grasp of your consciousness.

It is important to know what a person was. But it's more important to know what they are now.

You never see a smiling runner.

There has been a seismic shift in the business world. The great classical business principles still hold true but they need to be fused with cutting edge internet technology.

My father wanted me to learn self-defense, so I enrolled in the Academy and loved it from the start.

Perfection does not come from belief or faith. Talk does not count for anything. Parrots can do that. Perfection comes through the disinterested performance of action.