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Intelligence is the wife, imagination is the mistress, memory is the servant

All intelligent thoughts have already been thought; what is necessary is only to try to think them again

There is no worse sorrow than remembering happiness in the day of sorrow

Happiness is nothing more than good health and a bad memory

Yesterday is but today's memory, and tomorrow is today's dream

An education which does not cultivate the will is an education that depraves the mind. An education isn't how much you have committed to memory, or even how much you know. It's being able to differentiate between what you know and what you don't