Mistakes can be corrected by those who pay attention to facts but dogmatism will not be corrected by those who are wedded to a vision.

可持续性不是一种选择；它是我们对后代的责任。

In mathematics, the most profound ideas often arise from the simplest observations.

The poor are not irrational; they are just as rational as anyone else, but they operate under very different constraints.

"I like the night. Without the dark, we'd never see the stars."

Take away love and our earth is a tomb.