In the depth of winter, I finally learned that within me there lay an invincible summer.
Live as if you were to die tomorrow. Learn as if you were to live forever.
There is always some madness in love. But there is always, also, some method in madness.
The future depends on what you do today.
If we knew what it was we were doing, it would not be called research, would it?
Logic will get you from A to Z; imagination will get you everywhere.