@rob1770 The first thing I would point out is that if you are in Christ God has revealed the greatest truth of all to you! Even if every week all a minister had to feed the congregation was the Gospel, that is a beautiful feast. And God has saved you from the most ancient of lies - that we do not need God.
Beyond that, I would echo what @Keldon_Scott said - that it takes time to learn truth even as a Christian.
In Jewish culture in Jesus’ day, a man could not be recognized as a Rabbi until they were 30 years old. But why? Surely there were younger men with a heart to serve.
I think part of the answer is that it takes time to learn wisdom and have a good enough grasp of life / God’s Word to teach it to others.
Proverbs 4:7 - The beginning of wisdom is this: Get wisdom. Though it cost all you have, get understanding.
Proverbs 11:14 - For lack of guidance a nation falls, but victory is won through many advisers.
As we seek to grow as Christians and teachers of the Word, we must realize it takes hard work in study / practice and humility to learn from many other wise men (like Ravi).
In this way God forces us to rely on His Body and also teaches us humility.
But what are the implications for us as teachers?
My personal advice - don’t teach what you don’t know. If you don’t know, just be honest.
In terms of being afraid that teaching only partial truth will not bring glory to God, I think D. L. Moody is a great life to study.
At first, D. L. Moody always preached judgment. He had never heard of God’s great love through the cross. Once he heard about God’s love, he preached that more. But he had never heard of the power of the Spirit. Once he learned about the power of the Spirit from the Moravians, he preached that…
Moody used what truth was at his disposal - and possibly overemphasized certain parts of it at certain times in his life. Yet God honored his sincere commitment to seek and save the lost through Christ. And I think that is comforting - if we approach the responsibility of teaching with humility and determination - not going beyond what we know - God can use us in mighty ways and teach us more as we discourse with other Christians and grow deeper in Christ.