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Don't be embarrassed by your failures, learn from them and start again.
Your time and space are limited. Remove, give away, throw out things in your life that don‘t spark joy any longer in order to make room for those that do.
Mathematics is the language of the universe, and through it, we can unlock the secrets of existence.
Your work is going to fill a large part of your life, and the only way to be truly satisfied is to do what you believe is great work.