Hallward tries to give Wotton credit for being a kinder man than his words would indicate, but Wotton won't allow it. He says, "The reason we all like to think so well of others is that we are all afraid for ourselves. The basis of optimism is sheer terror. We think that we are generous because we credit our neighbor with those virtues that are likely to benefit ourselves. We praise the banker that we may overdraw our account, and find good qualities in the highwayman in the hope that he may spare our pockets."
What does "spare" mean?