The futility of seeking contentment in faith as an hypothesis alone is especially manifest in our time. This is an age of swiftly changing ideas in every realm. As in science, so in religion, today one theory holds the field to be displaced tomorrow by another. A man in theology, as much as in politics or psychology, goes to bed supposing he has settled his opinions, and wakes up to find a new array of evidence that disturbs his confidence. When, therefore, religious faith has meant no more to its possessor than theory, there is no security or rest. Each day the winds of opinion shift and veer, and minds at the beginning obstinate in their beliefs, at last, dismayed by the reiterated uncertainties of thought, give up their faith. Where, then, have the men of faith found the immovable center of their confidence? Paul revealed the secret. On the side of his particular opinions he frankly confessed his limited and uncertain knowledge. "Now we know in fragments," he wrote, "now we see through a glass darkly." "How unsearchable are his judgments and his ways past tracing out!" But on the side of his trust he is adamant: "I know _him_ whom I have believed." The certainty of his life was his relationship with a person, and his beliefs were the best he yet had thought in the explication and establishment of that trust. The great believers of the Church continually have exhibited this dual aspect of their faith. Even St. Augustine, facing the profound mysteries involved in his trinitarian belief, complains that human speech is pitiably futile in trying to explain what "Three persons" means, and that if he uses the familiar phrase, he does so not because he likes it, but because he may not be silent and knows no better thing to say. But when Augustine prays to the God whose nature is so unfathomable that no man can see it fully or express it adequately, he reveals no such uncertain thought: "Grant me, even me, my dearest Lord, to know Thee and love Thee and rejoice in Thee.... Let the love of Thee grow every day more and more here, that it may be perfect hereafter; that my joy may be great in itself and full in Thee. I know, O God, that thou art a God of truth; O make good Thy gracious promises to me!" So children do not fully understand an earthly father and often hold conceptions grotesquely insufficient to do justice to his life and work. But they may have for him well-founded trust. Even in the years of infancy an ennobling personal relationship begins, despite the inadequacy of their beliefs, and that trust yearly deepens while mental concepts shift and change with access of new knowledge. _The abiding core of a child's life with his father is not belief but trust._