By What Authority?
"And when he was come into the temple, the chief priests and the elders of the people came unto him as he was teaching, and said, By what authority doest thou these things? and who gave thee this authority?" (Matthew 21:23)
"And as all have not faith, seek ye diligently and teach one another words of wisdom; yea, seek ye out of the best books words of wisdom; seek learning, even by study and also by faith." (D&C 88:118)
"...the things of God are of deep import; and time, and experience, and careful and ponderous and solemn thoughts can only find them out. Thy mind, O man! if thou wilt lead a soul unto salvation, must stretch as high as the utmost heavens, and search into and contemplate the darkest abyss, and the broad expanse of eternity—thou must commune with God." (Joseph Smith, TPJS, page 137)
“I met with the twelve at Brother Joseph’s. He conversed with us in a familiar manner on a variety of subjects, and explained to us the Urim and Thummim which he found with the plates, called in the Book of Mormon the Interpreters. He said that every man who lived on the earth was entitled to a seer stone, and should have one, but they are kept from them in consequence of their wickedness, and most of those who do find one make an evil use of it, he showed us his seer stone.” (Brigham Young, Mill. Star v. 26, no. 8, p. 118)
"Be willing to receive the truth, let it come from whom it may; no difference, not a particle. Just as soon receive the Gospel from Joseph Smith as from Peter, who lived in the days of Jesus. Receive it from one man as soon as another. If God has called an individual and sent him to preach the Gospel that is enough for me to know; it is no matter who it is, all I want is to know the truth." (Brigham Young, Discourses of Brigham Young, by John A. Widtsoe, p 17)
"The duty of the elders, priests, teachers, deacons, and members of the church of Christ...to teach, expound, exhort, baptize, and watch over the church...And visit the house of each member, and exhort them to pray vocally and in secret and attend to all family duties." (D&C 20:38, 42, 47)
"It is the privilege of every Elder to speak of the things of God; and could we all come together with one heart and one mind in perfect faith the veil might as well be rent today as next week, or any other time, and if we will but cleanse ourselves and covenant before God, to serve Him, it is our privilege to have an assurance that God will protect us at all times." (Joseph Smith, TPJS Section 1 pg. 8)