The populace may hiss me, but when I go home and think of my money, I applaud myself.
I was what you are, you will be what I am.
I beseech you to treasure up in your hearts these my parting words: Be ashamed to die until you have won some victory for humanity.
Take subject matter equal to your powers, and ponder long, what your shoulders cannot bear, and what they can.
To know all things is not permitted.
Nothing is so difficult but that man will accomplish it.