My husband and I were so closely united by our affection and our common work that we passed nearly all of our time together.

It's always good to marry your best friend.

I never see what has been done; I only see what remains to be done.

It is my earnest desire that some of you should carry on this scientific work and keep for your ambition the determination to make a permanent contribution to science.

You cannot hope to build a better world without improving the individuals.

First principle: never to let one's self be beaten down by persons or by events.

We must have perseverance and above all confidence in ourselves.