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

"I have frequently been questioned, especially by women, of how I could reconcile family life with a scientific career. Well, it has not been easy."

"I am one of those who think like Nobel, that humanity will draw more good than evil from new discoveries."

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

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