„There is no blue without yellow and without orange, and if you put in blue, then you must put in yellow, and orange too, mustn’t you?“

— Vincent Van Gogh
„There is no blue without yellow and without orange, and if you put in blue, then you must put in yellow, and orange too, mustn't you? Oh well, you will tell me that what I write to you are only banalities.“
— Vincent Van Gogh
„At present I absolutely want to paint a starry sky. It often seems to me that night is still more richly coloured than the day; having hues of the most intense violets, blues and greens. If only you pay attention to it you will see that certain stars are lemon-yellow, others pink or a green, blue and forget-me-not brilliance. And without my expatiating on this theme it is obvious that putting little white dots on the blue-black is not enough to paint a starry sky.“
— Vincent Van Gogh