To be is to be perceived.
The universe is not only stranger than we imagine, it is stranger than we can imagine.
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.
"if you think tough men are dangerous, wait until you see what weak men are capable of.
保持领先的唯一途径是不断创新和适应。