We believe in God, that Being Who made us and the whole world, and governs all things in the universe.
The Existence of God is demonstrated:
I. From the knowledge of ourselves: for, considering within ourselves that we cannot have created ourselves, we necessarily conclude that there exists a Being who made us and all creatures.
II. From the contemplation of the universe: for, beholding the sun in the daytime, and the moon and stars at night, regularly moving in the heavens; vegetables and animals created upon the earth for our service and benefit; and regarding the winds and rains, which contribute to the good temperature of the air and the plenty of the fruits of the earth,—all of which man, with all his powers, can neither bring into existence nor regulate,—we conclude that there exists a Being who ordains and governs them all.
III. From the universal consent of all nations upon the subject: for every where, amongst all nations, even the most barbarous and savage, altars were to be seen, with sacrifices smoking upon them; and so strong is the innate sense in man that there is a God, that he chose rather to worship stocks and stones in the place of God, than suppose that there was no God.
IV. From the internal conviction of our conscience: for, when we do good, conscience approves us; but when we do evil, it reproaches us, and thus convinces us that there exists a Being, intelligent and righteous, who will discriminate good from evil, and reward the one and punish the other.
V. From that desire of a supreme good, and of perfect happiness, which is implanted within us: for our desires are ever seeking to enjoy whatsoever is good; and this desire is so intense, that nothing which this world affords can completely gratify it; and consequently, for the perfect gratification of our desires, there is a necessity for a supreme good,—and this good is God. Whence it follows that atheism—that is, the belief that there is no God—is opposed to human nature itself.
John Thomas Seccombe, tran., The Great Catechism of the Holy Catholic, Apostolic, and Orthodox Church, Katechesis (London: Simpkin, Marshall, & Co., 1867), 2–3.