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After climbing a great hill, one only finds that there are many more hills to climb.
Every mental state is a link in the chain of consciousness.
In mathematics, the art of proposing a question must be held of higher value than solving it.
Youth is not a time of life; it is a state of mind; it is not a matter of rosy cheeks, red lips and supple knees; it is a matter of the will, a quality of the imagination, a vigor of the emotions; it is the freshness of the deep springs of life.