en_tn/1ti/03/09.md

They should keep the mystery of the faith with a clean conscience

"They must continue to believe, with a clean conscience, the true message God has revealed to us." This refers to a truth that had existed for some time but that God was showing to them at that moment. Paul speaks of true teaching about God as if it were an object that a person could keep with himself. (See: rc://en/ta/man/jit/figs-metaphor)

the mystery of the faith

This can be stated in active form. Alternate translation: "the truth of the faith that God revealed" (See: rc://en/ta/man/jit/figs-activepassive)

faith with a clean conscience

Paul speaks of a person's knowledge that he has done no wrong as if that knowledge or conscience were clean. Alternate translation: "faith, knowing they have tried their hardest to do what is right" (See: rc://en/ta/man/jit/figs-metaphor)