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The great majority of us are required to live a life of constant duplicity. Your health is bound to be affected if, day after day, you say the opposite of what you feel, if you grovel before what you dislike, and rejoice at what brings you nothing but misfortune.

Friendships are different from all other relationships. Unlike acquaintanceship, friendship is based on love. Unlike lovers and married couples, it is free of jealousy. Unlike children and parents, it knows neither criticism nor resentment. Friendship has no status in law. Business partnerships are based on a contract. So is marriage. Parents are bound by the law. But friendships are freely entered into, freely given, freely exercised.

The happy people are those who are producing something; the bored people are those who are consuming much and producing nothing.

I have always been amazed at the way an ordinary observer lends so much more credence and attaches so much more importance to waking events than to those occurring in dreams.... This woman...is above all the plaything of my memory and I want her in my dreams...

Imagine that I am riding a bicycle toward you. As I approach an intersection I nearly collide, so it seems to me, with a horsedrawn cart. I swerve and barely avoid being run over. Now think of the event again, and imagine that the cart and the bicycle are both traveling close to the speed of light. If you are standing down the road, the cart is traveling at right angles to your light of sight. You see me, by reflected sunlight, traveling toward you. Would not my speed be added to the speed of light so that my image would get to you considerably before the image of the cart? Should you not see me swerve before you see the cart arrive? Can the cart and I approach the intersection simultaneously from my point of view, but not from yours? Could I experience a near collision with the cart while you perhaps see me swerve around nothing and pedal cheerfully on toward the town of Vinci? These are curious and subtle questions. They challenge the obvious. There is a reason that no one thought of them before Einstein. From such elementary questions, Einstein produced a fundamental rethinking of the world, a revolution in physics.