“Just do what must be done. This may not be happiness, but it is greatness”

“A baby is an inestimable blessing and bother”

“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”

“Little children are still the symbol of the eternal marriage between love and duty ”

“Life is a romantic business, but you have to make the romance.”

“Unquestionably, it is possible to do without happiness; it is done involuntarily by nineteen-twentieths of mankind”