יצחק אבינו

The Divine service of יצחק was characterized by the quality of גבורה, as indicated by the verse: "The Dread of Yitzchok" (פחד יצחק).

Because יצחק served ה' through fear and awe, he could not tolerate even the slightest presence of evil in his surroundings.

As a result, he became blind—unable to see the ketores being offered by עשו's Canaanite wives, who were engaged in עבודה זרה.