I have to stay alone in order to fully contemplate and feel nature.
If he sees nothing within, then he should stop painting what is in front of him.
The painter should paint not only what he has in front of him, but also what he sees inside himself.
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 artist should not only paint what he sees before him, but also what he sees in himself. If, however, he sees nothing within him, then he should also refrain from painting what he sees before him. Otherwise his pictures will be like those folding screens behind which one expects to find only the sick or the dead.