This melody has been swimming in my head today, applying to everything, as the Word of God is wont to do... I grew up in an LCMS congregation, singing hymns and psalms and liturgy, and many of them have stuck with me. I thank God. I have fallen in love with the melodies that carry Scripture from the pages of the Bible into the air from the pipes of the organ and the lips of my brothers and sisters in Christ, and every so often they play back, sometimes in my own young voice. Today was one of those times.
This particular refrain comes from an arrangement of Psalm 31 and a song of Isaiah (12:2-9). The melody that has stuck with me is the one printed in the CW, p. 77...
Surely it is God who saves me;
I will trust in him and not be afraid.
For the Lord is my stronghold and my sure defense,
and he will be my Savior.