To manage the large mould make a model of the small mould, make a small room in proportion. - Leonardo da Vinci

Weight, force and casual impulse, together with resistance, are the four external powers in which all the visible actions of mortals have their being and their end.

I know that there are numberless people who would, to satisfy a whim, destroy God and all the universe.

Painting is poetry which is seen and not heard, and poetry is a painting which is heard but not seen. These two arts, you may call them both either poetry or painting, have here interchanged the senses by which they penetrate to the intellect.