"El pasado no es más que una ilusión, pero es una ilusión necesaria."

得到你想要的东西的代价是得到你曾经想要的东西。

Challenges are what make life interesting. Overcoming them is what makes life meaningful.

Sometimes silence speaks louder than words.

Mathematics is not a deductive science—that's a cliché. When you try to prove a theorem, you don't just list the hypotheses and then start to reason. What you do is trial and error, experimentation, guesswork.