Nothing in life is to be feared. It is only to be understood.

All my life through, the new sights of Nature made me rejoice like a child.

One never notices what has been done; one can only see what remains to be done.

You cannot hope to build a better world without improving the individuals. To that end each of us must work for his own improvement, and at the same time share a general responsibility for all humanity, our particular duty being to aid those to whom we think we can be most useful.