The key word in this passage is time. Underline it in your Bible. The writer tells his readers, when by virtue of the passing of time you ought to be entering college, you’ve got to go back to kindergarten and learn your ABC’s all over again. When you should be communicating the truth to others as teachers, you need to have someone communicate the truth to you. In fact, he says, you still need milk, not solid food. Solid food is for the mature. Who are the mature? Are they the people who go to seminary?