Read it through once

My business habits had one other bright feature, which I called “leaving a Margin.” For example; supposing Herbert’s debts to be one hundred and sixty-four pounds four-and-twopence, I would say, “Leave a margin, and put them down at two hundred.” Or, supposing my own to be four times as much, I would leave a margin, and put them down at seven hundred. I had the highest opinion of the wisdom of this same Margin, but I am bound to acknowledge that on looking back, I deem it to have been an expensive device. For, we always ran into new debt immediately, to the full extent of the margin, and sometimes, in the sense of freedom and solvency it imparted, got pretty far on into another margin.