richmahn_en_tn/psa/136/004.md

for his covenant faithfulness endures forever

The abstract noun "faithfulness" can be translated with an adjective. See how you translated this in Psalms 136:1. AT: "because he remains faithful to his covenant forever" (See: rc://en/ta/man/translate/figs-abstractnouns)

by wisdom

That is, because he is wise.