Q: Why is the Kaddish prayer said in Aramaic? It was composed when Aramaic was the common spoken language for most Jews, but why has it not been changed to Hebrew since then?

A: There have been several answers to this question over the years, some of them esoteric and mystical. The main idea is this:

We do not want the angels to understand the Kaddish since, apparently, they do not understand Aramaic. This prayer achieves an exaltation of God which transcends the heights that angels can achieve with their divine service so we don’t want them to be hurt and “jealous.”