And righteousness shall be the belt of his loins, and faithfulness the belt of his waist.
Read Chapter 11
Athanasius the Apostolic
AD 373
At all times let us stand firm, but especially now, although many afflictions overtake us and many heretics are furious against us. Let us then, my beloved brothers, celebrate with thanksgiving the holy feast that now draws near to us, “girding up the loins of our minds,” like our Savior Jesus Christ, of whom it is written, “Righteousness shall be the girdle of his loins, and faithfulness the girdle of his reins.” - "Festal Letter 3"
“Righteousness shall be the girdle of his waist, and truth the girdle of his loins.” As a king has a belt made of gold and precious stones, so in a prophetic manner, he speaks about the belt made of righteousness and truth. By the belt we may also understand the divinity of the Word, because he is righteousness, according to the apostle: “He is the source of your life in Christ Jesus, whom God made our wisdom, our righteousness and sanctification and redemption.” He is also the truth, according to Evangelist: “I am the way, and the truth, and the life.” The Word being the righteousness and the truth that comes from the root of Jesse, his waist [belt] points out to his attribute as king and warrior as the Word who conquers the invisible powers and hosts. - "Commentary on Isaiah 11.7"