Kate Atkinson said this quote

He had made a vow, a private promise to the world in the long dark watches of the night, that if he did survive then in the great afterward he would always try to be kind, to live a good, quiet life. Like Candide, he would cultivate his garden. quietly. And that would be his redemption. Even if he could add only a feather to the balance it would be some kind of repayment for being spared. When it was all over and the reckoning fell due, it may be that he would be in need of that feather.