We do not lack devices for measuring these miserable days of ours, in which it should be our pleasure that they be not frittered away without leaving… - Leonardo da Vinci

There will be many who will eagerly and with great care and solicitude follow up a thing, which, if they only knew its malignity, would always terrify them. Of those men, who, the older they grow, the more avaricious they become, whereas, having but little time to stay, they should become more liberal.

Remember that your bird should have no other model than the bat, because its membranes serve as an armour or rather as a means of building together the pieces of its armour, that is the framework of the wings.

Quando ouvimos os sinos, ouvimos aquilo que já trazemos em nós mesmos como modelo. Sou da opinião que não se deverá desprezar aquele que olhar atentamente para as manchas da parede, para os carvões sobre a grelha, para as nuvens, ou para a correnteza da água, descobrindo, assim, coisas maravilhosas. O génio do pintor há-de se apossar de todas essas coisas para criar composições diversas: luta de homens e de animais, paisagens, monstros, demónios e outras coisas fantásticas. Tudo, enfim, servirá para engrandecer o artista.