Pachad Yitzchak: serving Hashem with awe
Yaakov Avinu called Hashem "the G-d of Avraham and the Pachad (awe) of Yitzchak." The Kedushas Levi explains that each of the Avos served Hashem through a different middah. Avraham served with love and kindness (chesed), Yitzchak served with awe and fear of Heaven (gevurah), and Yaakov combined the two into harmony (tiferes). Elsewhere in the same parsha he writes that Yitzchak was connected with the Divine name that expresses justice and awe. Yitzchak's way teaches that holding back, restraint and awe are also a path of closeness to Hashem.
Source: Kedushas Levi, Bereishis, Toldos (on Bereishis 25:19); Bereishis 31:42
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