You know, when you commit a mistake while writing something, you try to erase it, to correct it. But when you do so, that area of the paper you are writing on, loses its quality bit by bit, and now it's no more like what it was. Even while erasing that mistake, you will only be removing it's mark that's 'on' the paper. What will still be left, is the depth it made 'in' the paper.

Now it won't be the same writing there; the smoothness, the toughness, the thickness, all damaged in quality. Whenever you'll touch it, you'll feel what you have done, the depths will...