The greatest compliment that was ever paid me was when one asked what I thought, and attended to my answer.
Two things fill me with constantly increasing admiration and awe, the longer and more earnestly I reflect on them: the starry heavens without and the moral law within.
It takes 20 years to build a reputation and five minutes to ruin it. If you think about that, you'll do things differently.
How exquisitely human was the wish for permanent happiness, and how thin human imagination became trying to achieve it.
A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools.