Science is nothing but developed perception, interpreted intent, common sense rounded out and minutely articulated.
Few people think more than two or three times a year; I have made an international reputation for myself by thinking once or twice a week.
He who is not very strong in memory should not meddle with lying.
When they discover the center of the universe, a lot of people will be disappointed to discover they are not it.
Wit makes its own welcome, and levels all distinctions. No dignity, no learning, no force of character, can make any stand against good wit.
A billion here, a billion there, pretty soon it adds up to real money.
Every day you may make progress. Every step may be fruitful. Yet there will stretch out before you an ever-lengthening, ever-ascending, ever-improving path. You know you will never get to the end of the journey. But this, so far from discouraging, only adds to the joy and glory of the climb.