There is no result in nature without a cause; understand the cause and you will have no need of the experiment.
Leonardo da VinciI love this site. It was lovingly hand-shaped it. Your soul transformed this into this art. It was perfect. I have tried to create another equal to it... but to no avail, so I will just have to paint the Sistine Chapel.
Leonardo da VinciAvoid the precepts of those thinkers whose reasoning is not confirmed by experience.
Leonardo da Vinci