Not all things worth counting are countable and not all things that count are worth counting.

Knowledge is limited.

Insofar as we may at all claim that slavery has been abolished today, we owe its abolition to the practical consequences of science

Even if you have to go through hell - go without hesitation.

... one does people the best service by giving them some elevating work to do and thus indirectly elevating them.

If you can't explain something simply, you don't know enough about it.

Everything that the human race has done and thought is concerned with the satisfaction of deeply felt needs and the assuagement of pain. One has to keep this constantly in mind if one wishes to understand spiritual movements and their development. Feeling and longing are the motive force behind all human endeavor and human creation, in however exalted a guise the latter may present themselves to us.