John Calvin on Genesis 34:5-6

5. And Jacob heard. Moses inserts a single verse concerning the silent sorrow of Jacob. We know that they who have not been accustomed to reproaches, are the more grievously affected when any dishonor happens to them. Therefore the more this prudent man had endeavored to keep his family pure from every stain, chaste and well-ordered, the more deeply is he wounded. But since he is at home alone, he dissembles, and keeps his grief to himself, till his sons return from the field. Moreover, by this word, Moses does not mean that Jacob deferred vengeance till their return; but that, being alone and devoid of counsel and of consolation, he lay prostrate as one disheartened. The sense then is, that he was so oppressed with insupportable grief, that he held his peace. Or, he might be restrained by prudence from imparting his feelings to others, lest by making them public, he should expose himself to danger, before he was prepared to meet it. At all events, it was wise to restrain the expression of his indignation, till he was surrounded by those who might help him with their counsel, or attempt the rescue of his daughter from the hands of her violator. — Ed. By using the word “defiled,” Moses teaches us what is the true purity of man; namely, when chastity is religiously cultivated, and every one possesses his vessel in honor. But whoever prostitutes his body to fornication, filthily defiles himself. If then Dinah is said to have been polluted, whom Shechem had forcibly violated, what must be said of voluntary adulterers and fornicators?