Scorned as Timber, Beloved of the Sky, 1935, Emily Carr
The writings of Emily Carr are in my opinion as good as her paintings.
Hundreds of Thousands, a collection of her journals, is an enjoyable read if you're interested in understanding how artists struggle in many ways, including how to communicate things in their artwork. For her, it was all about showing how God can be seen in nature. She lived on the Canadian West Coast, with all its towering trees and rich plant life.
Do not forget life, artist. A picture is not a collection of portrayed objects nor is it a certain effect of light and shade nor is it a souvenir of a place nor a sentimental reminder, not is it a shadow of color nor a magnificence of form, nor yet it it anything seeable or sayable. It is a glimpse of God interpreted by the soul. It is life to some degree expressed.