The discarded covering is easily mistaken for an imperfect duplicate. Its outlines resemble those of the creature that has left it. Yet its significance lies precisely in what the creature no longer needs. The empty shell is not a failed organism. It is a record of a successful departure.
Editors often treat removed words as failed words. The words may instead have become inconvenient, redundant, unprovable, or too revealing. Their removal tells us that a choice occurred, not whether the choice was correct. To study revision is therefore to compare a surviving statement with the pressure that shaped it. The pressure is not always visible in either sentence alone.
Let concordance remain a claim, not a measurement. Agreement does not become evidence by being repeated.
A page with its corrections concealed offers a smooth surface. A page with every correction exposed offers a difficult one. Neither smoothness nor difficulty establishes truth. But only the second allows a reader to examine the relation between the statement and its making. We retain the discarded language because an explanation of the surface may be found beneath it.
The practical instruction is less grand than the metaphor. Place the copies together. Mark what they share. Mark what belongs to only one. Keep those categories separate. A disagreement is not the same object as an absence, and an absence in the later copy does not tell you which witness to read. Learn the operation before praising its result.