But solid food is for the mature, for those who have their powers of discernment trained by constant practice to distinguish good from evil.
Any teacher gets fed up with pupils who pay little attention to what is being taught. It will be little wonder if pupils sitting staring out of the window all the time will learn little, and may end up being kept behind when the others move on.
The person who wrote the letter to the Hebrews obviously felt like a fed up teacher. Those he had been teaching should have been mature believers by the time he was writing. Instead, they were like children who were still being fed milk when they should have been on solid food — they were immature.
Paul had the same complaint about the church in Corinth: "I fed you with milk, not solid food, for you were not ready for it." (1 Corinthians 3:2) The reason seemed to be the same in both cases. People were arguing about unimportant things and neglecting to study the Bible and the deeper things of the Christian faith. "And a person who is living on milk isn't very far along in the Christian life and doesn't know much about doing what is right." (verse 13, NLT)
I think a lot of us are like that. We are lazy and inattentive about spiritual things; we may neglect our Bible readings, our prayer times and our reading of books that will help us to deepen our understanding of God's truth. When this happens, we don't just fail to grow in our Christian life, but we are in danger of slipping back into unfaithfulness.
Dear Lord, help me to mature in my Christian life through your Word. Amen.