“Those who educate children well are more to be honored than parents, for these only gave life, those the art of living well
“The thing is to become a master and in your old age to acquire the courage to do what children did when they knew nothing
“Spread love everywhere you go: first of all in your own home. Give love to your children, to a wife or husband, to a next-door neighbor
“There are so many things about which some old man ought to tell one while one is little; for when one is grown one would know them as a matter of course
“The pursuit of truth and beauty is a sphere of activity in which we are permitted to remain children all our lives
“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