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The only limits you have are the ones you set for yourself.
Theoretically there is a perfect possibility of happiness: believing in the indestructible element within oneself, and not striving towards it.
In science, the credit goes to the man who convinces the world, not to the man to whom the idea first occurs.
没有改变就不可能进步,而无法改变思想的人也无法改变任何事。