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To do great things is difficult,but to command great things is more difficult.
To be free is not to have no master, but to choose your own.
Be the change that you wish to see in the world.
I don't mind being a symbol but I don't want to become a monument. There's nothing sadder than a monument.
The pursuit of science is more than the pursuit of understanding. It is the pursuit of wonder.
The best way to predict the future is to create it.