Good culture is born of a good disposition; and since the cause is more to be praised than the effect, I will rather praise a good disposition without culture, than good culture without the disposition.
Leonardo da VinciNo human investigation can claim to be scientific if it doesn't pass the test of mathematical proof.
Leonardo da VinciTo discover the soul living in somebody's body, we watch the surrounding of the body, and if it's messy and disordered, so is the soul.
Leonardo da VinciThe acquisition of knowledge is always of use to the intellect, because it may thus drive out useless things and retain the good. For nothing can be loved or hated unless it is first known.
Leonardo da VinciNature is so delightful and abundant in its variations that among trees of the same kind there would not be found one which nearly resembles another, and not only the plants as a whole, but among their branches, leaves, and fruit, will not be found one which is precisely like another.
Leonardo da Vinci