The great revolution of the future will be Nature's revolt against man.
When in doubt, risk it
Past and present, it is all the same, books are necromancers, they exercise an influence more varied, more lasting, than any magic known to man.
The possession of a great many things, even the best of things, tends to blind one to the real value of anything.
Books worth reading are worth re-reading.
No man is ever old enough to know better.