定理是数学的永久文献。
Theorems are the permanent literature of mathematics.
Consciousness is the theater where survival strategies are played out.
人通过克服困难而成长。
The improvement of the productive powers of labor, and the greater part of the skill, dexterity, and judgement with which it is anywhere directed or applied, seem to have been the effects of division of labor.
The best way to predict the future is to invent it.