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Careless words bring suffering, while gentle words bring peace.
The universe would look to a two-dimensional creature who spend its life moving on the service of what turned out to be a globe, it could travel for millions of years and would always return to its starting point, it would never be conscious of what was above it or beneath it.
凡事天下要考察有无的原则,必定是以众人的耳目所见所闻的实情以知有与无来作为标准的。 
Mathematics is the key to understanding the universe.