A piece of chalk

I remember one splendid morning, all blue and silver, in the summer holidays when I reluctantly tore myself away from the task of doing nothing in particular, and put on a hat of some sort and picked up a walking-stick, and put six very bright-colored chalks in my pocket [and took with me some brown paper to draw on].
. . . . . . * * * * *
But as I sat scrawling these silly figures on the brown paper, it began to dawn on me, to my great disgust, that I had left one chalk, and that a most exquisite and essential chalk, behind. I searched all of my pockets, but I could not find any white chalk. Now, those who are acquainted with philosophy (nay, religion) which is typified in the art of drawing on brown paper, know that white is positive and essential. I cannot avoid remarking here on a moral significance. One of the wise and awful truths which this brown-paper art reveals, is this, that white is a color. It is not a mere absence of color; it is a shining and affirmative thing, as fierce as red, as definite as black. When, so to speak, your pencil grows red-hot, it draws roses; when it grows white-hot, it draws stars. And one of the two or three defiant verities of the best religious morality, of real Christianity, for example, is exactly this same thing; the chief assertion of religious morality is that white is a color. Virtue is not the absence of vices or the avoidance of moral dangers; virtue is a vivid and separate thing, like pain or a particular smell. Mercy does not mean not being cruel or sparing people revenge or punishment; it means a plain and positive thing like the sun, which one has either seen or not seen. Chastity does not mean abstention from sexual wrong; it means something flaming, like Joan of Arc. In a word, God paints in many colors; but He never paints so gorgeously, I had almost said so gaudily, as when He paints in white.
In a sense our age has realized this fact, and expressed it in our sullen costume. For if it were really true that white was a blank and colorless thing, negative and non-committal, then white would be used instead of black and grey for the funeral of this pessimistic period. We should see city gentlemen in frock coats of spotless silver linen, with top hats as white as wonderful arum lilies. Which is not the case.
Meanwhile, I could not find my chalk.
--G.K. Chesterton