The painter should paint not only what he has in front of him, but also what he sees inside himself. If he sees nothing within, then he should stop painting what is in front of him.

A painting which does not take its inspiration from the heart is nothing more than futile juggling.

What the newer landscape artists see in a circle of a hundred degrees in Nature they press together unmercifully into an angle of vision of only forty-five degrees. And furthermore, what is in Nature separated by large spaces, is compressed into a cramped space and overfills and oversatiates the eye, creating an unfavorable and disquieting effect on the viewer.

I must stay alone and know that I am alone to contemplate and feel nature in full.

I am not so weak as to submit to the demands of the age when they go against my convictions. I spin a cocoon around myself; let others do the same. I shall leave it to time to show what will come of it: a brilliant butterfly or maggot.

Close your bodily eye, that you may see your picture first with the eye of the spirit. Then bring to light what you have seen in the darkness, that its effect may work back, from without to within.

The pure, frank sentiments we hold in our hearts are the only truthful sources of art.