From 'Grammar of Painting and Engraving'
Painting purifies people by its mute eloquence. The philosopher writes his thoughts for those who can think and read. The painter shows his thought to all who have eyes to see. That hidden and naked virgin, Truth, the artist finds without seeking. He throws a veil over her, encourages her to please, proves to her that she is beautiful, and when he has reproduced her image he makes us take her, and takes her himself, for Beauty.
In communicating to us what has been seen and felt by others, the painter gives new strength and compass to the soul. Who can say of how many apparently fugitive impressions a man's morality is composed, and upon what depends the gentleness of his manners, the correctness of his habits, the elevation of his thoughts? If the painter represents acts of cruelty or injustice, he inspires us with horror. The 'Unhappy Family' of Proudhon moves the fibres of charity better than the homilies of a preacher.... Examples of the sublime are rare in painting, as the painter is compelled to imprison every idea in a form. It may happen, nevertheless, that moved by thoughts to which he has given no form, the artist strikes the soul as a thunderbolt would the ear. It is then by virtue of the thought perceived, but not formulated, that the picture becomes sublime.
POUSSIN'S 'SHEPHERDS OF ARCADIA'
From 'Grammar of Painting and Engraving'
In a wide, heavily wooded country, the sojourning-place of that happiness sung by the poets, some peasants have discovered a tomb hidden by a thicket of trees, and bearing this brief inscription: "Et in Arcadia ego" (I too lived in Arcadia). These words, issuing from the tomb, sadden their faces, and the smiles die upon their lips. A young girl, carelessly leaning upon the shoulder of her lover, seems to listen, mute and pensive, to this salutation from the dead. The thought of death has also plunged into reverie a youth who leans over the tomb with bowed head, while the oldest shepherd points out the inscription he has just discovered. The landscape that completes this quiet picture shows reddened leaves upon arid rocks; hillocks that melt in the vague horizon, and in the distance, something ill-defined that resembles the sea. The sublime in this painting is that which we cannot see; it is the thought that hovers over it, the unexpected emotion that fills the soul of the spectator, transported suddenly beyond the tomb into the infinite unknown.