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

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

I was taught that the way of progress was neither swift nor easy.

We must have perseverance and above all confidence in ourselves.

There are sadistic scientists who hurry to hunt down errors instead of establishing the truth.

Sometimes my courage fails me and I think I ought to stop working, live in the country and devote myself to gardening. But I am held by a thousand bonds, and I don't know when I shall be able to arrange things otherwise. Nor do I know whether, even by writing scientific books, I could live without the laboratory.

Each of us must work for his own improvement, and at the same time share a general responsibility for all humanity.