The Aesiratanya is the beginning of Semenyud of Iguerasakayi dash. The Navi says in Mgilasaija, Khazde Hashem Kile Samnu, surely the kindness of Hashem has not ended. Similar to what we say in Semenaesare Kile Samra Sadecha. However, instead of saying Samu, the Navi says Samnu with a nun, which literally means we have not ended.
With the other standards we will focus on another Pasuk. Referring to the terror, the Pasuk says Mihiminoy Hdaslamay. On one hand, the Pasuk refers to the terror as H, fire, which is the attribute of Gvura severity. On the other hand, the Pasuk says that the terror comes Mihiminoy from the right side, the attribute of Hressek, kindness.
The explanation is as follows. The terror comes from the kindness of Hashem. Through the terror Hashem's presence shines for the lower worlds. When a person performs one of the mitzvahs of the terror, he draws godliness below.
However, this kindness goes through the channels of Gvura, constraint and concealment. For the mitzvahs must be performed with material objects, like Tfilin, karbonis, tzedaka, etc. Even the more spiritual mitzvahs, like love and all of Hashem, are also limited and measured. The heart cannot contain an unlimited love for Hashem.
As Kazal tells us that at the time of the giving of the terror, the people felt such an intense love for Hashem that they're in a shamas departed from their bodies.