“Painting is silent poetry, and poetry painting that speaks.”

A Treatise on Painting (1651); "The Paragone"; compiled by Francesco Melzi prior to 1542, first published as Trattato della pittura by Raffaelo du Fresne (1651)
Context: 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.

On poetry

To the Public, plate 3 (the last paragraph)
1800s, Jerusalem The Emanation of The Giant Albion (c. 1803–1820)

Aphorism 7
Les Caractères (1688), Des Ouvrages de l'Esprit
Context: There are certain things in which mediocrity is intolerable: poetry, music, painting, public eloquence. What torture it is to hear a frigid speech being pompously declaimed, or second-rate verse spoken with all a bad poet's bombast!

Education: What Knowledge Is of Most Worth?
Essays on Education (1861)

The Monthly Magazine

Las artes (pintura, poesía, etc.) no son solo éstas. Artes son también comer, beber, caminar: todo acto es un arte.
Source: Aphorisms (2002), p. 60

Source: Infinite in All Directions (1988), Ch. 1 : In Praise of Diversity
Context: Science is not a monolithic body of doctrine. Science is a culture, constantly growing and changing. The science of today has broken out of the molds of classical nineteenth-century science, just as the paintings of Pablo Picasso and Jackson Pollock broke out of the molds of nineteenth century art. Science has as many competing styles as painting or poetry. The diversity of science also finds a parallel in the diversity of religion.