Spend some time living a good life. Cleanse yourselves from all impurity and avoid every sin. Then, when you yourselves have begun to despise your sins, they will be forgiven you. You will be forgiven your sins if you renounce them.
Someone once spoke of the Christian as having a set of built-in antennae to tell him or her what love requires in a particular situation. This, of course, is not the whole truth about Christian ethics.