Only a Truly Good God would say...

Only a Truly Good God would say that men are not to be trusted as spiritual fathers, special teachers, or masters of followers. It is men who desire something selfish who claim to be a spiritual father, special teacher, or master worthy of followers. Usually what such men want is something of this temporary life: power, money, or confidence from either false ideas or followers deceived by them.

Where does God say this? In the person of Jesus the Christ, warning his followers not to be part of claiming certain men have special religious worth. Holding one man more worthy religiously than another is no less than worshiping men in the place of God Himself (as the Holy Spirit, God the Father, or God the Messiah). Every hypocritical teacher who pretends to teach the Scriptures avoids teaching this passage among others.

"But as for you, do not be called 'Rabbi,' because you have one Teacher, and you are all brothers. Do not call anyone on earth your father, because you have one Father, who is in heaven. And do not be called masters either, because you have one Master, the Messiah. The greatest among you will be your servant. Whoever exalts himself will be humbled, and whoever humbles himself will be exalted. " Matthew 23:8-12 Holman Christian Standard Bible

Until the Messiah revealed God through His life and sacrifice, and that revelation was completed by the Apostles He personally taught, God's entire word was not complete. Since the last writings of the Apostles, it is complete.

God takes it very seriously indeed when anyone pretends His word says something it does not. This is why the last book of the popularly agreed scripture is the book of Revelation, which ends with:

And I solemnly declare to everyone who hears the words of prophecy written in this book: If anyone adds anything to what is written here, God will add to that person the plagues described in this book. And if anyone removes any of the words from this book of prophecy, God will remove that person’s share in the tree of life and in the holy city that are described in this book.
Revelation 22:18-19, NLT