Faith so generally is discussed as though it were a creed, accepted once for all and thereafter statically held, that the influence of our moods on faith is not often reckoned with. But the moods of faith are the very pith and marrow of our actual experience. When a Christian congregation recite together their creedal affirmation, "I believe in God," it _sounds_ as though they all maintained a solid, constant faith. But when in imagination, one breaks up the congregation and interprets from his knowledge of men's lives what the faith of the individuals actually means, he sees that they believe in God not evenly and constantly, but more or less, sometimes very much, sometimes not confidently at all. Our faith in God is not a static matter such as the recitation of a creed suggests. Some things we do believe in steadily. That two plus two make four, that the summed angles of a triangle make two right angles--of such things we are unwaveringly sure. No moods can shake our confidence; no griefs confuse us, no moral failures quench our certainty. Though the heavens fall, two and two make four! But our faith in God belongs in another realm. It is a vital experience. It involves the whole man, with his chameleon moods, his glowing insights, his exalted hours, and his dejected days when life flows sluggishly and no great thing seems real. This experience of variable moods in faith does not belong especially to feeble folk, whose ups and downs in their life with God would illustrate their whole irresolute and flimsy living. The great believers sometimes know best this tidal rise and fall of confidence. Elijah one day, with absolute belief in God, defied the hosts of Baal and the next, in desolate reaction, wanted to die. Luther put it with his rugged candor, "Sometimes I believe and sometimes I doubt." John Knox, at liberty to preach, "dings the pulpit into blads" in his confident utterance; but the same Knox recalled that, in the galleys, his soul knew "anger, wrath, and indignation which it conceived against God, calling all his promises in doubt." The Master himself was not a stranger to this experience. He believed in God with unwavering assurance, as one believes in the shining of the sun. But the fact that the sun perpetually shines did not imply that every day was a sunshiny day for him. The clouds came pouring up out of his dark horizons and hid the sun. "Now is my soul troubled; and what shall I say?" (John 12:27). And once the fog drove in, so dense and dark that one would think there never had been any sun at all. "My God, my God, why hast thou forsaken me?" (Matt. 27:46).