Be wary of those who claim to do good to avoid the wrath of god, or the censure of law, or the shame of their family and friends. While their actions may be in keeping with the good, they do not pursue good for the sake of goodness only, but also to avoid punishment. What will happen to them if there is no fear of punishment? How will they act then?
Rather, it is best to do good for goodness’ sake only. Do right because it is right. Be virtuous because it is virtuous. And what is good? To follow nature: to help others, to preserve the peace, to leave your corner of the cosmos a better place than it was when you found it.