Sin is so evil that it is not capable of any good at all. Though the air is never so dark, yet it is capable of light. That would be a dismal darkness that was not capable of light coming into it. That which is bitter, though never so bitter, yet is capable of recieving that which will sweeten. That which is never so venemous is yet capable of such things as will make it wholesome; but sin is so dark that it is incapable of light, so bitter that there is no way to make it sweet, so venemous that there is no way to make it wholesome.