Our author addresses men whose spiritual life was thus imperilled. Their condition is not that of the heathen world in its agony of despair. He does not call his readers, in the words of St. Paul to the jailer at Philippi, to trust themselves into the hands of the Lord Jesus Christ, that they may be saved. Yet he too insists on faith. He is anxious to show them that he is not preaching another gospel, but unfolding the meaning of the same conception of faith, which is the central principle of the Gospel revealed at the first by Christ to their fathers, and applied to the wants of the heathen by the Apostle of the Gentiles.
If so, it goes without saying that the writer does not intend to give a scholastic definition of faith. The New Testament is not the book in which to seek formal definitions. For his present purpose we require only to know that, whatever else faith includes, confidence in reference to the objects of our hope must find a place in it. Faith bridges over the chasm between hope and the things hoped for. It saves us from building castles in the air or living in a fool's paradise. The phantoms of worldliness and the phantoms of religion (for they too exist) will not deceive us. In the course of his discussion in the Epistle the author has used three different words to set forth various sides of the same feeling of confidence. One refers to the freedom and boldness with which the confidence felt manifests its presence in words and action.[252] Another signifies the fulness of conviction with which the mind when confident is saturated.[253] The third word, which we have in the present passage, describes confidence as a reality, resting on an unshaken foundation, and contrasted with illusions.[254] He has urged Christians to boldness of action and fulness of conviction. Now he adds that faith is that boldness and that wealth of certitude in so far as they rest upon reality and truth.
We can now in some measure estimate the value of the Apostle's description of faith as an assurance concerning things hoped for, and apply it to give force to the exhortations of the Epistle. The evil heart of unbelief is the moral corruption of the man whose soul is steeped in sensual imaginations and never realises the things of the Spirit. They who came out of Egypt by Moses could not enter into rest because they did not descry, beyond the earthly Canaan, the rest of the spirit in God. Others inherit the promises, because on earth they lifted their hearts to the heavenly country. In short, the Apostle now tells his readers that the true source of Christian constancy and boldness is the realisation of the unseen world.
But faith is this assurance concerning things hoped for because it is a proof[255] of their existence, and of the existence of the unseen generally. The latter part of the verse is the broad foundation on which faith rests in all the rich variety of its meanings and practical applications. Here St. Paul, St. James, and the writer of the Epistle to the Hebrews meet in the unity of their conception. Whether men trust unto salvation, or develop their inner spiritual life, or enter into communion with God and lift the weapon of unflinching boldness in the Christian warfare, trust, character, confidence, all three derive their being and vitality from faith, as it demonstrates the existence of the unseen.
The Apostle's language is a seeming contradiction. Proof is usually supposed to dispense with faith and compel us to accept the inference drawn. He intentionally describes faith as occupying in reference to spiritual realities the place of demonstration. Faith in the unseen is itself a proof that the unseen world exists. It is so in two ways.