Quote by Jean d'Alembert

"Doubt is an uncomfortable condition, but certainty is a ridiculous one."

"The greatest mathematicians, like the greatest poets, are men of imagination."

"I believe in God, but I do not believe that God has any of the properties which theologians ascribe to him."

"The true method of knowledge is experiment."

"I believe in working hard for what you want."

"Never underestimate the power of determination."

"I don't need a reason to fight."

"The most important thing is the mission. Nothing else matters."