The function of mental processes is to mediate between the needs of the organism and the demands of the environment.

The propensity to truck， barter， and exchange one thing for another is common to all men， and to be found in no other race of animals.

We must design products with their end-of-life in mind from the very beginning.

The future is a story we are writing with every choice we make.

改变一个人的关键是改变他的自我意识。