Genesis 20:5

In the integrity of my heart... — Not only does Abimelech assert this, but Elohim (see Genesis 20:6) admits the plea. And yet this Philistine king indulges in polygamy, and claims the right of taking the female relatives of any one passing through his territory to add them to his harem. But the words mean no more than that he was not consciously violating any of his own rules of morality, and thus illustrate the Gospel principle that men will be punished not by an absolute decree, but equitably, according to their knowledge (Luke 12:47). Abimelech was doing wrong, and was suffering punishment, but the punishment was remedial, and for his advancement in right-knowing and right-doing. It is thus by means of revelation that men have attained to a proper understanding of the moral law. Though often called “the law of Nature,” yet Nature does not give it, but only acknowledges it when given. The inner light is but a faint and inconstant glimmering, but Christ is the true light; for only by Him does the law of Nature become a clear-rule for human guidance (John 1:9; Romans 2:14; Matthew 6:23).