На греческом: zographian poiesin sioposan prosagoreuei, ten de poiesin zographian lalousan.

Painting is silent poetry, and poetry painting that speaks.
Quoted by Plutarch, De gloria Atheniensium 3.346f.

Variant translations:
Painting is silent poetry, and poetry is painting with the gift of speech.
Painting is silent poetry, poetry is eloquent painting.