Life is full of uncertainties, and that is what makes it interesting.
Mathematics is not about numbers, equations, computations, or algorithms: it is about understanding.
Life lessons will be presented to you in the order they are needed. Everything you need to master the lesson is within you. Once you have truly learned a lesson， you will be presented with the next one. If you are alive， that means you still have lessons to learn.
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The most important thing in science is not so much to obtain new facts as to discover new ways of thinking about them.