“In a time of turbulence and change, it is more true than ever that knowledge is power.”

It is insane that two men, sitting on opposite sides of the world, should be able to decide to bring an end to civilization.

Those who do nothing are inviting shame as well as violence. Those who act boldly are recognizing right as well as reality.

Our most basic common link is that we all inhabit this planet. We all breathe the same air. We all cherish our children’s future. And we are all mortal.

We need people who can dream of things that never were.

It is an unfortunate fact that we can secure peace only by preparing for war.

Democracy may not be perfect, but at least I don’t have to build a wall to keep my people in.

Every accomplishment starts with the decision to try.

Peace need not be impracticable, and war need not be inevitable.

One person can make a difference, and everyone should try.

Great crises produce great men, and great deeds of courage.

We stand for freedom. That is our conviction for ourselves; that is our only commitment to others.

The one unchangeable certainty is that nothing is unchangeable or certain.

History will never accept difficulties as an excuse.

The time to repair the roof is when the sun is shining.

No sane society chooses to commit national suicide.

A tax cut means higher family income and higher business profits and a balanced federal budget.

Life has changed after Rio. Winning a silver medal was a huge moment for me. It has come with a lot of responsibilities.

Politics without principles, Education without character, Science without humanity, and Commerce without morality are not only useless, but also positively dangerous.

People often ask whether marriage has changed me. I didn’t marry because I had to change.

Add a few drops of venom to a half truth and you have an absolute truth.

When you can’t change the direction of the wind — adjust your sails

My role models have kept on changing.

The body is just a water bubble. The mind is like a mad monkey. Do not follow either the body or the mind. Follow the Conscience. It is above the mind. It is permanent. It is the voice of God, the voice of unchanging truth inside you.

This is a new point in my life, and things are totally changing. But like the sunsets I saw on Tybee Island, the miles I’ve already gone are going to stay with me.