The Life itself sufficient in itself to teach.

“Did not the Apoſtles preach up the Meaſure of Life, the Grace of God in their day, Chriſt within, the Word of Faith nigh in the mouth and heart, the Anointing within, its ſufficiency to teach all things, &c. and yet did they ſo preach it, as to overthrow the Miniſtry, or their Gifts or Service, either towards them that were without or them that were within? Had they not power over them in the Lord?” View in Source Document

Source: Some Queries Concerning the Order and Government of the Church if Christ.