I think that Paul does give some elucidation in Hebrews 5:1-10
“Every high priest chosen from among mortals is put in charge of things pertaining to God on their behalf, to offer gifts and sacrifices for sins. 2He is able to deal gently with the ignorant and wayward, since he himself is subject to weakness; 3and because of this he must offer sacrifice for his own sins as well as for those of the people. 4And one does not presume to take this honour, but takes it only when called by God, just as Aaron was.”
As verse 4 explains, we can’t presume to become teachers, because not all are called.
If we presume, we could lead others astray. As parts of Christ’s mystical body, the Church we have different functions. Within the body, the eye must be the eye, the hand must act as the hand.
"To some, God’s “gift was that they should be apostles; to some, prophets; to some, evangelists; to some, pastors and teachers; so that the saints together make a unity in the work of service, building up the body of Christ. In this way we are all to come to unity in our faith and in our knowledge of the Son of God…If we live by the truth and in love, we shall grow in all ways into Christ, who is the head by whom the whole body is fitted and joined together, every joint adding its own strength, for each separate part to work according to its functions.” [Ephesians 4:11-13’15-16]
See 1 Corinthians 12:12-22
12 For just as the body is one and has many members, and all the members of the body, though many, are one body, so it is with Christ. 13 For in the one Spirit we were all baptized into one body—Jews or Greeks, slaves or free—and we were all made to drink of one Spirit.
14 Indeed, the body does not consist of one member but of many. 15 If the foot would say, “Because I am not a hand, I do not belong to the body,” that would not make it any less a part of the body. 16 And if the ear would say, “Because I am not an eye, I do not belong to the body,” that would not make it any less a part of the body. 17 If the whole body were an eye, where would the hearing be? If the whole body were hearing, where would the sense of smell be? 18 But as it is, God arranged the members in the body, each one of them, as he chose. 19 If all were a single member, where would the body be? 20 As it is, there are many members, yet one body. 21 The eye cannot say to the hand, “I have no need of you,” nor again the head to the feet, “I have no need of you.” 22 On the contrary, the members of the body that seem to be weaker are indispensable"