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

A scientist in his laboratory is not a mere technician: he is also a child confronting natural phenomena that impress him as though they were fairy tales.

Stability can only be attained by inactive matter.

After all, science is essentially international, and it is only through lack of the historical sense that national qualities have been attributed to it.

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

It was like a new world opened to me, the world of science, which I was at last permitted to know in all liberty.

Life is not easy for any of us. But what of that? We must have perseverance and above all confidence in ourselves.