CCC 904 “Christ. .. fulfills this prophetic office, not only by the hierarchy. .. but also by the laity. He accordingly both establishes them as witnesses and provides them with the sense of the faith [sensus fidei] and the grace of the word”1
To teach in order to lead others to faith is the task of every preacher and of each believer.2

1 LG 35.
2 St. Thomas Aquinas, STh. III, 71, 4 ad 3.