When Rivka experienced the pain of her twin sons wrestling in her womb, she went to seek G-d’s advice. Some say she went to Shem, son of Noach, while others say she went to a different prophet, perhaps even Avraham himself. But why didn’t she go to her own husband, Yitzchak, who was a tzaddik and navi in his own right? The answer is that Yitzchak had prayed on her behalf and it was thanks to his prayers that she was pregnant. Had she gone to him, he would have felt bad for having caused her this pain, and it would also have shown a lack of appreciation for this gift. Therefore, she could not approach Yitzchak about it. It was a matter of sensitivity.