Genesis 30:5

5. And Bilhah conceived. It is wonderful that God should have deigned to honor an adulterous connection with offspring: but he does sometimes thus strive to overcome by kindness the wickedness of men, and pursues the unworthy with his favor. Moreover, he does not always make the punishment equal to the offenses of his people, nor does he always rouse them, alike quickly, from their torpor, but waits for the matured season of correction. Therefore it was his will that they who were born from this faulty connection, should yet be reckoned among the legitimate children; just as Moses shortly before called Bilhah a wife, who yet might more properly have been called a harlot. And the common rule does not hold, that what had no force from the beginning can never acquire validity by succession of time; for although the compact, into which the husband and wife sinfully entered against the Divine command and the sacred order of nature, was void; it came to pass nevertheless, by special privilege, that the conjunction, which in itself was adulterous, obtained the honor of wedlock. At length Rachel begins to ascribe to God what is his own; but this confession of hers is so mixed up with ambition, that it breathes nothing of sincerity or rectitude. She pompously announces, that her cause has been undertaken by the Lord. As if truly, she had been so injured by her sister, that she deserved to be raised by the favor of God; and as if she had not attempted to deprive herself of his help. We see, then, that under the pretext of praising God, she rather does him wrong, by rendering him subservient to her desires. Add to this, that she imitates hypocrites, who, while in adversity, rush against God with closed eyes; vet when more prosperous fortune favors them, indulge in vain boastings, as if God smiled upon all their deeds and sayings. Rachel, therefore, does not so much celebrate the goodness of God, as she applauds herself Wherefore let the faithful, instructed by her example, abstain from polluting the sacred name of God by hypocrisy.