Philo had already emphasised the distinction between the child in knowledge and the man of full age and mature judgment. St. Paul had said more than once that such a distinction holds among Christians. Many are carnal; some are spiritual. In his writings the difference is not an external one, nor is the line between the two classes broad and clear. The one shades into the other. But, though we may not be able to determine where the one begins and the other ends, both are tendencies, and move in opposite directions. In the Epistle to the Hebrews the distinction resembles the old doctrine of habit taught by Aristotle. Our organs of sense are trained by use to distinguish forms and colours. In like manner, there are inner organs of the spirit,[89] which distinguish good from evil, not by mathematical demonstration, but by long-continued exercise[90] in hating evil and in loving holiness. The growth of this spiritual sense is connected by our author with the power to understand the higher doctrine. He only who discerns, by force of spirited insight, what is good and what is evil, can also understand spiritual truths. The difference between good and evil is not identical with "the word of righteousness." But the moral elevation of character that clearly discerns the former is the condition of understanding also the latter.
"Wherefore"--that is, inasmuch as solid food is for full-grown men--"let us have done[91] with the elementary doctrines, and permit ourselves to be borne strongly onwards[92] towards full growth of spiritual character."[93] The Apostle has just said that his readers needed some one to teach them the rudiments. We should have expected him, therefore, to take it in hand. But he reminds them that the defect lies deeper than intellectual error. The remedy is not mere teaching, but spiritual growth. Apart from moral progress there can be no revelation of new truths. Ever-recurring efforts to lay the foundation of individual piety will result only in an apprehension of what we may designate personal and subjective doctrines.
The Apostle particularises. Repentance towards God and faith in God are the initial graces.[94] For without sorrow for sin and trust in God's mercy God's revelation of Himself in His Son will not be deemed worthy of all acceptation. If this is so, the doctrines suitable to the initial stage of the Christian life will be--(1) the doctrine of baptisms and of laying on of hands, and (2) the doctrine of the resurrection of the dead and of eternal judgment. Repentance and faith accept the gospel of forgiveness, which is symbolised in baptism, and of absolution, symbolised in the laying on of hands. Again, repentance and faith realise the future life and the final award; the beginning of piety reaching forth a hand, as runners do, as if to grasp the furthest goal before it touches the intermediate points. Yet every intermediate truth, when apprehended, throws new light on the soul's eschatology. In like manner civilization began with contemplation of the stars, long before it descended to chemical analysis, but at last it applies its chemistry to make discoveries in the stars.
This, then, is the initial stage in the Christian character,--repentance and faith; and these are the initial doctrines, baptism, absolution, resurrection, and judgment. How may they be described? They all centre in the individual believer. They have all to do with the fact of his sin. One question, and one only, presses for an answer. It is, "What must I do to be saved?" One result, and one only, flows from the salvation obtained. It is the final acquittal of the sinner at the last day. God is known only as the merciful Saviour and the holy Judge. The whole of the believer's personal existence hovers in mid-air between two points: repentance at some moment in the past and judgment at the end of the world. Works are "dead," and the reason why is that they have no saving power. There is here no thought of life as a complete thing or as a series of possibilities that ever spring into actuality, no thought of the individual as being part of a greater whole. The Church exists for the sake of the believer, not the believer for the sake of the Church. Even Christ Himself is nothing more to him than his Saviour, Who by an atoning death paid his debt. The Apostle would rise to higher truths concerning Christ in the power of His heavenly life. This is the truth which the story of Melchizedek will teach to such as are sufficiently advanced in spirituality to understand its meaning.