Esto mihi in Deum protectorem, et in locum refugii, ut salvum me facias: quoniam firmamentum meum, et refugium meum es tu: et propter nomen tuum dux mihi eris, et enutries me.
“Be a protector-God for me, and a place of refuge, so that you make me safe. For you are my firmament and my refuge. And you will be my guide because of your name, and you will feed me.” (Ps 31(30):3–4)
Like most chants in the 6th mode (which mainly oscillates between the pitches fa (f) and la (a) and seldom raises above or sinks below), Esto mihi expresses calm, peace, and certainty. Adam of Fulda in the 15th century will explain the 6th mode as pietate probati, it belongs to “whoever is tried and tested in his faith.”
The is no doubt: This God helps and will help.
Maybe this chant catches us in a moment when we cannot believe its message. Then it is ours to hear in it the voice of those who were tried and tested in their faith. Thus we might find calm and peace, even if the certainty has not yet come.