That may be, in part, natural to it; in part, the result of affliction.
The less it was occupied with healthy things, the more it would be in danger of turning in the unhealthy direction.
He may have observed himself, and made the discovery."
"You are sure that he is not under too great a strain?"
"I think I am quite sure of it."
"My dear Manette, if he were overworked now-"
"My dear Lorry, I doubt if that could easily be. There has been a violent stress in one direction, and it needs a counterweight."
"Excuse me, as a persistent man of business. Assuming for a moment, that he was overworked; it would show itself in some renewal of this disorder?"
"I do not think so.
I do not think," said Doctor Manette with the firmness of self-conviction, "that anything but the one train of association would renew it.