I said: Read a couple systematic theology books and you will become "spiritually advanced".
No you won’t. Just the opposite. Your advancement will be hindered. You will continue to live on milk.
This statement is not rational. For example, it implies seminary is a waste of time. It implies sermons, Sunday school are a waste of time. It disregards scripture which say God gives certain individuals the gift of teaching. What good is a gift of teaching if one doesn't teach. This is what Systematic Theology books, seminary and physical churches do, granted not perfectly.
This contradicts scripture:
Proverbs 11:14 Without counsels do a people fall, And deliverance [is] in a multitude of counsellors.
Proverbs 15:22 Without counsel, plans go awry, But in the multitude of counselors they are established.
The idea the God hasn't given men the task to teach (the Great commission); this logic reputes the formation of the Bible. Specifically, the English bible was dependent upon men to both create the canon and to translate the original language into English. (Aside: those things being guided by God) So, you would have no Bible to read were it not for men guided by God which JLB now says has no worth.
How are those with weak minds suppose to learn of God? How are children suppose to know the truth? Do we wait till they can read? Surely not. Proverbs 22:6 Train up a child in the way he should go, and when he is old he will not depart from it.
This is why the Church is so divided, because they follow the teachings of man.
To assume that if you put 100 people into a room and they only had access to a Bible and no other theological training ... that outcome would be unanimity if incredulous.
Acts 8:26 And he rose and went. And there was an Ethiopian, a eunuch, a court official of Candace, queen of the Ethiopians, who was in charge of all her treasure. He had come to Jerusalem to worship 28 and was returning, seated in his chariot, and he was reading the prophet Isaiah. 29 And the Spirit said to Philip, “Go over and join this chariot.” 30
So Philip ran to him and heard him reading Isaiah the prophet and asked, “Do you understand what you are reading?” 31 And he said, “How can I, unless someone guides me?” And he invited Philip to come up and sit with him.
Note: Phillip didn't say, "Well, I can't help you ... read it for yourself and "Ask the Holy Spirit to lead and guide you."
Spiritual babes follow the teachings of man.
I am not saying teachers do not make errors. There are false teachers. But teachers are beneficial. Be like the Bereans and check the Scripture to validate what is said. Read 5 Systematic Theology books and compare. Books like this are built on ten of thousands of man hours of biblical study that no one person could do. (Well, maybe 1 person in 1,000,000 ... I suppose Augustine