Regarding the Yirah/Ahavah and Assei/Lavin, R' Yosef Engel says that generally speaking Asei Docheh Lo Saaseh because Ahavas Hashem should generally be more of our focus in our service of Hashem than Yirah (is this a Ramban Al HaTorah perhaps?) but Ain Assei Docheh Lo Saaseh SheBaMikdash because of Mora Mikdash - there the Yir'ah overrides the Ahavah. (That part is R' Yosef Engel).
<br><br>Also related to this is the fact that after the Akeidah Hashem tells Avraham that now He knows that Avraham is a 'Yarei Elokim', since he was willing to sacrifice his son. Nobody would ever sacrifice my son out of fear of consequences. I believe that the Ksav V'Kabbalah (I might be wrong about that source) there explains that the type of Yirah referred to there is the Yirah of denting the relationship.
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