Evolutionary psychology is not about what's unchangeable in human nature, but about what was adaptive in our ancestral environment.
真相是，我们都有自己的现实版本，有时这些版本与事实不符。
——1963年6月25日在西德市政厅柏林墙前的演说
Change is not merely necessary to life—it is life.
When we no longer have the power to change a situation, we are challenged to change ourselves.
The man who is fit to handle pig iron is not fit to handle the management of pig iron.