If we do evil and then try to plug the leak by doing good, it’s like plugging a leak in the bottom of a pot and pouring water in. Or like plugging a leak in the bottom of a basin and pouring water in. The bottom of the pot, the bottom of the basin, isn’t in good shape. Our abandoning of evil isn’t yet in good shape. If you pour water in, it all still seeps out and the basin goes dry. Even if you pour water in all day, it still seeps out bit by bit, and eventually there’s no water left. You don’t gain the benefits from it that you wanted.
– Ajahn Chah, Theravada, Thai Forest Tradition.