The subject matter, says the writer, is difficult to explain, not because of the writer’s lack of skill, but because of the readers’ inability to comprehend.
What does, "“You are slow to learn" mean?
What is the author implying when he says, “By this time you ought to be teachers?”
V. 13 The Christian occupied with elementary truths is spiritually “still an infant” and must be treated as such. He is “unskilled in the word of righteousness” to take a translation a little more literal the Greek apeiros means “without experience of” and so comes to mean “unskilled.”