Toldot 5773

The Kli Yakar explains the love Yitzchak had for Esav and bases his pshat off of a mishnah in pirkei avos (5:16): Love that is dependent on certain outside factors doesn't last; once the factors disappear, so too does the love. Yitzchak only loved Esav at the very moment Esav fed him. Once he finished eating, his love for Esav disappeared. This is unlike Rivkah's love for Yaakov which had no outside reason attached to it, and "a love like this doesn't disappear."