Augustine of Hippo
Not by their own strength. For He has raised up mighty heralds, whom He refers to as mountains; lowly in their own sight, yet exalted in Him. These mountains are formed by His might. What does one of these mountains proclaim? We carry within us the sentence of death, so that we might not place our hope in ourselves, but in God who brings the dead to life. (2 Cor. 1:9) The one who relies on self and does not place their trust in Christ does not belong to those mountains that He has established through His strength. Forming mountains by His might, He dons strength. What does it mean to be girded with power? Those who center their lives on Christ create a protection around Him.
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We all share in Him, and thus He is in our midst: we are all supported by Him, as we believe in Him; and since our faith arises not from our own abilities, but from His might, He is girded in His power, not by our own capabilities.