In what attitude of mind and heart does religion come most fully to its rights? Is it not in the attitude of prayer? When we kneel before God, not with the body merely, but with the mind and heart, we have assumed the attitude which above all others deserves the name of religious. And this religious attitude by way of eminence is obviously just the attitude of utter dependence and humble trust. He who comes to God in prayer, comes not in a spirit of self-assertion, but in a spirit of trustful dependence. No one ever addressed God in prayer thus: "0 God, thou knowest that I am the architect of my own fortunes and the determiner of my own destiny. Thou mayest indeed do something to help me in the securing of my purposes after I have determined upon them. But my heart is my own, and thou canst not intrude into it; my will is my own, and thou canst not bend it. When I wish thy aid, I will call on thee for it. Meanwhile, thou must await my pleasure." Men may reason somewhat like this; but that is not the way they pray. There did, indeed, once two men go up into the temple to pray. And one stood and prayed thus to himself (can it be that this "to himself" has a deeper significance than appears on the surface?), "God, I thank thee that I am not as the rest of men." While the other smote his breast, and said, "God be merciful to me a sinner." Even the former acknowledged a certain dependence on God; for he thanked God for his virtues. But we are not left in doubt in which one the religious mood was most purely exhibited. There is One who has told us that with clearness and emphasis.
All men assume the religious attitude, then, when they pray. But many men box up, as it were, this attitude in their prayer, and shutting it off from their lives with the Amen, rise from their knees to assume a totally different attitude, if not of heart, then at least of mind. They pray as if they were dependent on God's mercy alone; they reason -- perhaps they even live -- as if God, in some of his activities at least, were dependent on them. The Calvinist is the man who is determined to preserve the attitude he takes in prayer in all his thinking, in all his feeling, in all his doing. That is to say, he is the man who is determined that religion in its purity shall come to its full rights in his thinking, and feeling, and living. This is the ground of his special mode of thought, by reason of which he is called a Calvinist; and as well of his special mode of acting in the world, by reason of which he has become the greatest regenerating force in the world. Other men are Calvinists on their knees; the Calvinist is the man who is determined that his intellect, and heart, and will shall remain on their knees continually, and only from this attitude think, and feel, and act. Calvinism is, therefore, that type of thought in which there comes to its rights the truly religious attitude of utter dependence on God and humble trust in his mercy alone for salvation.
There are at bottom but two types of religious thought in the world -- if we may improperly use the term "religious" for both of them. There is the religion of faith; there is the "religion" of works. Calvinism is the pure embodiment of the former of these; what is known in Church History as Pelagianism is the pure embodiment of the latter of them. All other forms of "religious" teaching which have been known in Christendom are but unstable attempts at compromise between the two. At the opening of the fifth century, the two fundamental types came into direct conflict in remarkably pure form as embodied in the two persons of Augustine and Pelagius. Both were expending themselves in seeking to better the lives of men. But Pelagius in his exhortations threw men back on themselves; they were able, he declared, to do all that God demanded of them -- otherwise God would not have demanded it. Augustine on the contrary pointed them in their weakness to God; "He himself," he said, in his pregnant speech, "He himself is our power." The one is the "religion" of proud self-dependence; the other is the religion of dependence on God. The one is the "religion" of works; the other is the religion of faith. The one is not "religion" at all -- it is mere moralism; the other is all that is in the world that deserves to be called religion. Just in proportion as this attitude of faith is present in our thought, feeling, life, are we religious. When it becomes regnant in our thought, feeling, life, then are we truly religious. Calvinism is that type of thinking in which it has become regnant.Quoted from 'What is Calvinism?', from Selected Shorter Writings of Benjamin B. Warfield.