Quote by Sophie Germain
"Gratitude is the root of all happiness."
More from Sophie Germain
"Persistence is the path to success."
"The world of science and mathematics does not discriminate based on gender."
"I have penetrated into the essence of things and perceived that to solve the great problems we must change our way of thinking."
"Nothing is better able to guide us through life than to accustom ourselves to a fair examination of our own hearts."