"I particularly like the catchphrase of Leonardo Da Vinci: Ostinato Rigore! (Which means, pretty much, Relentless Rigor)."

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Leonardo da Vinci did not take received wisdom - whether from ancient classical thinkers or medieval scholars or from the Bible - without questioning it. And this was the beginning of the scientific method. This is another lesson for our time: that when we have evidence that contradicts a certain belief, we should be willing to change it. I think this made Leonardo, in some ways, a person who better understood the beauty of God's creation than a person who just takes all received wisdom from the Bible on faith.

— Walter Isaacson