This quote suggests that when a writer creates their writing, they should use their senses to help them imagine the story, and when a painter creates their art, they should use their senses to help them imagine the scene. For example, if a writer is describing a sunset, they may use their eyes to imagine the colors of the sky, and use the adjectives from the colors to create their writing. A painter may use their ears to listen to the sounds around them and use the rhythms and moods of the sounds to create their painting.