The road to this paradise was not as comfortable and alluring as the road to the religious paradise; but it has proved itself as trustworthy, and I have never regretted having chosen it.
Mechanics are the Paradise of mathematical sciences, because here we come to the fruits of mathematics.
It is better to have your head in the clouds, and know where you are, if indeed you cannot get it above them, than to breathe the clearer atmosphere below them, and think that you are in paradise.
I have always imagined that Paradise will be a kind of library.