Charles talked and wrote a great deal about the practice of "exchange". It was one of the root rules of the Company. One made a pact and picked up the other person's fear or grief or pain and carried it oneself. This was the theory at any rate. The trouble was that, while the theory was irrefutable, the practice was apt to be dubious.... but how, I asked myself, was I to "present myself shyly to Almighty God in exchange for..."?
Letters to Lelange (Kent State UP), Page 54