To such an extent does nature delight and abound in variety that among her trees there is not one plant to be found which is exactly like another; and not only among the plants, but among the boughs, the leaves and the fruits, you will not find one which is exactly similar to another.
Leonardo da VinciThe vine that has grown old on an old tree falls with the ruin of that tree, and through that bad companionship must perish with it.
Leonardo da VinciTruly man is the king of beasts, for his brutality exceeds them. We live by the death of others. We are burial places.
Leonardo da VinciTo me it seems that those sciences are vain and full of error which are not born of experience, mother of all certainty, first-hand experience which in its origins, or means, or end has passed through one of the five senses.
Leonardo da Vinci