Can the Ethiopian change his skin or the leopard its spots? Neither can you do good who are accustomed to doing evil.
What a statement of condemnation: if you are accustomed to doing evil, you cannot be expected to do good. There is only one way to overcome this: Jesus. When a person is cleansed of sin at the point of salvation, and purified by the blood of the Lamb, Christ Jesus, he/she can be expected to do good. In fact, we are told in Galatians 6:10, to do that very thing: “do good to all people, especially to those who belong to the family of believers.