en_tn/2co/04/13.md

the same spirit of faith

"the same attitude of faith." Here the word "spirit" refers a person's attitude and temperament.

according to that which was written

This can be stated in active form. Alternate translation: "as the one who wrote these words" (See: rc://en/ta/man/jit/figs-activepassive)

I believed, and so I spoke

This is a quote from the Psalms.