The best time to plant a tree was 20 years ago; the second-best time is now.

The elegance of a mathematical proof often mirrors the efficiency of the algorithm it describes.

Success is measured not just in profits, but in positive impact.

The most durable thing in writing is style, and style is the most valuable investment a writer can make with his time.

人类整个历史上最大的悲剧可能是宗教对道德的劫持。