A Theory Can Be Proved By Experiment;

Stand Still. The Trees Ahead And Bush Beside You Are Not Lost.

The Gift Of Fantasy Has Meant More To Me Than My Talent For Absorbing Positive Knowledge.

Never Regard Study As A Duty, But As The Enviable Opportunity To Learn

Life Is Like Riding A Bicycle. To Keep Your Balance, You Must Keep Moving.

The Release Of Atomic Power Has Changed Everything Except Our Way Of Thinking ... The Solution To This Problem Lies In The Heart Of Mankind. If Only I Had Known, I Should Have Become A Watchmaker. (1945)