That path was extraordinary; ordinarily people teach while the Spirit teaches within
But that was extraordinary. God did not see fit to use that path commonly when bringing people to faith and instructing them in heavenly teaching. He willed that people be taught by people and receive faith, yet with the Spirit himself teaching within and working with them.
So he instituted the sacred ministry in the Church and commanded pastors and teachers to announce, explain, and commend his Word publicly, and to bear witness to its truth. And what pastors do publicly and with authority, individual believers also are bound by divine ordinance to do privately, according to their measure, among those committed to their care.
Latin
XVII. Sed istud fuit extraordinarium. Neque Deo visum est hac via passim uti in hominibus ad fidem adducendis, et in doctrina caelesti instruendis. Sed voluit ut homines ab hominibus docerentur, et fidem acciperent, Spiritu tamen ipso intus docente et cooperante. Ideoque in Ecclesia ministerium sacrum instituit, jussitque ut pastores et doctores publice verbum ejus annunciarent, explicarent et commendarent, et de veritate illius testarentur. Quodque Pastores publice faciunt, et cum authoritate, singuli quoque fideles, ex ordinatione divina, tenentur id privatim pro suo modulo, facere apud eos qui curae illorum commissi sunt.