Musar על סנהדרין 76:19

Both the Zohar and Pardes Rimonim describe this angel also as עבד. Seeing that the Torah in Deut 14,1 describes Israel as "Children of the Lord your G–d", we find that Israel appears in a dual role. From the vantage point of the עולם האצילות, the purely spiritual domain, -seeing that our souls are anchored in that domain- our relationship with G–d is like that of children to their father. From the vantage point of the material world, the עולם הבריאה, and anything "below" that, however, our optimal status is that of עבד השם, a servant of the Lord. (This עולם הבריאה is called by Kabbalists the סוד האמה העבריה, "the mystical significance of the portion dealing with the Jewish maid-servant in Exodus chapter 21, whereas Mattatron is the סוד עבד עברי, seeing he represents the עולם האצילות). When Exodus 23,20 speaks about the angel G–d will send ahead of the Jewish people to guard and protect Israel on its journey and that angel is described as embodying G–d's name, Rashi, quoting ancient sources says that this is Mattatron whose name is identical with the name of G–d (Exodus 23,20). The numerical value of the letters in 314= מטטרון-שדי.