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The best mathematics is not just logical; it is intuitive and creative, blending rigor with imagination.
There is no point treating a depressed person as though she were just feeling sad, saying, 'There now, hang on, you'll get over it.' Sadness is more or less like a head cold- with patience, it passes. Depression is like cancer.
The best books are the ones that challenge you.
"Writing is a matter of patience and stubbornness, not talent."