As a day well spent makes sleep seem pleasant, so a life well employed makes death pleasant. A life well spent is long. - Leonardo da Vinci

As a day well spent procures a happy sleep, so a life well employed procures a happy death.

One has no right to love or hate anything if one has not acquired a thorough knowledge of its nature. Great love springs from great knowledge of the beloved object, and if you know it but little you will be able to love it only a little or not at all.

Fear arises sooner than anything else.

When you have drawn the same thing so many times that it seems that you know it by heart try to do it without the model; but having a tracing made of the model upon a thin piece of smooth glass and lay this upon the drawing you have made without the model. ...where you find that you have erred bear it in mind in order not to make the mistake again. ...if you cannot procure smooth glass to make a tracing... take a piece of very fine parchment well oiled and then dried, and when you have used it for for one drawing you can wipe this out with a sponge and do a second.