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Read through the most famous quotes by topic #requires
The beginning of a friendship, the fact that two people out of the thousands around them can meet and connect and become friends, seems like a kind of magic to me. But maintaining a friendship requires work. I don't mean that as a bad thing. Good art requires work as well. ↗
The final wisdom of life requires not the annulment of incongruity but the achievement of serenity within and above it. ↗
As you say, the way string theory requires all these extra dimensions and this comes from certain consistency requirements about how string should behave and so on. ↗