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"A man is rich in proportion to the number of things he can afford to let alone."
The truth doesn’t set you free, it just makes you see the chains.
The essence of mathematics lies in its freedom.
出自唐代诗人韦应物《寄李儋元锡》,梁羽生在《大唐游侠传》中引用
The only limit to our realization of tomorrow will be our doubts of today.