The power of mathematics lies in its ability to simplify the complex.

The price of freedom is eternal vigilance.

"A literatura é a expressão máxima da liberdade humana."

Thoughts pass in my mind like flocks of lucks in the sky.I hear the voice of their wings .

The most hateful torment for men is to have knowledge of everything but power over nothing.

我们地球的过去历史必须通过现在可以看到的现象来解释。