Luke is correct, I believe the scriptures teach God has equipped every believer with what he needs to know and understand the word of God, that is the Holy Spirit, the scriptures, and prayer.
1 Jn 2:27 But the anointing which ye have received of him abideth in you, and ye need not that any man teach you: but as the same annointing teacheth you of all things, and is truth, and is no lie, and even as it hath taught you, ye shall abide in him.
Does this verse say we need any man to teach us? Does it say the Spirit will teach us some things, or all things? Do you believe this verse?
2 Tim 3:16 All scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness:
17 That the man of God may be perfect, throughly furnished unto all good works.
Do we need men to teach us doctrine, or are the scriptures sufficient? If the scriptures can make the man of God perfect (mature), can that be improved upon? Do you believe this verse?
Jam 1:5 If any of you lack wisdom, let him ask of God, that giveth to all men liberally, and upbraideth not; and it shall be given him.
6 But let him ask in faith, nothing wavering. For he that wavereth is like a wave of the sea driven with the wind and tossed.
7 For let not that man think he shall receive any thing of the Lord.
I am not saying teachers are not useful or helpful, otherwise God would not have provided teachers to the church, but God has provided every believer what is necessary to know and understand the scriptures. We do need to study, but we also need to depend on the Spirit and ask God's help, but most of all we must believe.