There is no result in nature without a cause; understand the cause and you will have no need of the experiment.
Leonardo da VinciMany have made a trade of delusions and false miracles, deceiving the stupid multitudes.
Leonardo da VinciI abhor the supreme folly of those who blame the disciples of nature in defiance of those masters who were themselves her pupils
Leonardo da VinciOne painter ought never to imitate the manner of any other; because in that case he cannot be called the child of nature, but the grandchild. It is always best to have recourse to nature, which is replete with such abundance of objects, than to the productions of other masters, who learnt everything from her.
Leonardo da Vinci