In general, it is possible to say that in artists as deliberate, as careful as [Durer and Holbein], drawing is particularly tight and the color is as cold as the verity of mathematics. In other artists, on the contrary, in those who are the poets of the heart, like Raphael, Correggio, Andrea del Sarto, line has more suppleness and color, more winning tenderness. In others whom we call realists that is to say, whose sensibility is more exterior, in Rubens, Velasquez, Rembrandt, for example, line has a living charm with its force and its repose, and the color sometimes bursts into a fanfare of sunlight, sometimes fades into mist.
So, the modes of expression of men of genius differ as much as their souls, and it is impossible to say that in some among them drawing and color are better or worse than in others.

..I am always between two currents of thought, first the material difficulties, turning round and round to make a living; and second, study of color. I am always in hope of making a discovery there, to express the love of two lovers by a marriage of two complementary colors, their mingling and their opposition, the mysterious vibrations of kindred tones. To express the thought of a brow by the radiance of a light tone against a sombre background. To express hope by some star, the eagerness of a soul by a sunset radiance. Certainly there is nothing in that of stereoscopic realism, but is it not some thing that actually exists?

The reciprocal relation of color to color produces a phenomenon of a more mysterious order. This new phenomenon is psychological. A high sensitivity is necessary in order to expand color into the sphere of the surreal without losing creative ground. Color stimulates certain moods in us. It awakens joy or fear in accordance with its figuration. In fact, the whole world, as we experience it visually, comes to us through the mystic realm of color. Our entire being is nourished by it. This mystic quality of color should likewise find expression in a work of art.

We tend to discount a lot of meaning that goes on in life that's non-verbal. Color can convey a total range of mood and expression, of one's experience in life, without having to give it descriptive or literary qualities.

I am not an abstractionist...I am not interested in the relationships of color or form or anything else...I'm interested only in expressing basic human emotions — tragedy, ecstasy, doom and so on — and the fact that a lot of people break down and cry when confronted with my pictures show that I communicate those basic human emotions...The people who weep before my pictures are having the same religious experience I had when I painted them. And if you, as you say, are moved only by their color relationships, then you miss the point!

Colors, like features, follow the changes of the emotions.