Elliot says, "The apostle compares these Hebrews to babes, not on account of their innocent simplicity and teachableness, qualities which Christ recommended to all his disciples; but on account of their weakness and ignorance."
Gill says that it is "now thirty years from the day of Pentecost, in which the gifts of the Holy Ghost were bestowed in such an extraordinary manner, and a large number were converted...therefore considering the length of time, the opportunities and advantages they had enjoyed, it might have been expected, and indeed it is what should have been that they would have been teachers of others."
Adam Clarke says of strong meat, "The high and sublime doctrines of Christianity; the atonement, justification by faith, the gift of the Holy Ghost, the fullness of Christ dwelling in the souls of men, triumph in and over death, the resurrection of the body...This is the strong food the genuine Christian understands, receives, digests, and by which he grows."
"'Have their senses exercised.' The word signifies the different organs of sense, as the eyes, ears, tongue, and palate, nose, and finger ends...through which we gain the sensations called seeing, hearing, tasting, smelling, and feeling. These organs of sense, being frequently exercised or employed...acquire the power to discern the various objects of sense... and thus, being able to discern good from evil, they are in little danger of being imposed on by false doctrine, or by the pretensions of hypocrites; or of being deceived by the subtleties of Satan."
Matthew Henry said, "Christian experience is a spiritual sense, taste, or relish of the goodness, sweetness, and excellence of the truths of the gospel. And no tongue can express the satisfaction which the soul receives from a sense of Divine goodness, grace and love of it in Christ."
Oh, our society is full of baby Christians. Our churches are full of baby Christians who have remained babies for years and years. They do not have discernment and are vulnerable to many false teachers who wave something pretty and say, "Look over here!" They are gullible. The are unable to discern good and evil. It is because they are not willing to take up the word of God themselves and grow.