Beloved, you ask concerning posture in prayer, as though the matter were first of the body. Yet does the Lord begin not with the body, but with the heart?
When the disciples asked to be taught, the Lord did not say, “Stand thus,” or “kneel thus,” but he said, “When you pray, say: Our Father.” In this, He directs not the limbs, but the soul. For prayer is not first an act of the body, but the turning of the whole man unto God.
As the apostle Paul teaches, we draw near not in presumption, but in dependence. We cry “Father,” not because we stand upright in ourselves, but because we have been brought near by grace. Therefore the first posture is humility. If the heart is not bowed, the knee is of no account. This is the why the first of the beatitudes start with blessed are the poor in spirit for the Kingdom of heaven will be theirs.
Consider also how the Lord warns against those who pray to be seen. Here he strikes at the corruption of outward posture when it is severed from inward truth. For one may stand, yet be far from God, speak many words, yet not be heard. True prayer is not measured by form, but by sincerity and faith.
And yet, the body is not without its place. For man is not a spirit alone, but body and soul. Thus when the Lord in his agony fell upon his face, and when he knelt in prayer, he showed that the body may rightly express what the heart knows. Kneeling, bowing, falling low, these are fitting signs of reverence. But they are signs, not substance.
Therefore let it be said plainly.
The posture the Lord requires is a heart that is humbled before the holiness of God, submitted to his will, dependent upon His provision, and repentant before his mercy. This is the posture that cannot be feigned, for it is wrought by the Spirit of God within.
For no man prays rightly unless he is first taught by the Spirit. And the Spirit does not produce pride, but lowliness. He does not produce display, but sincerity. He does not lead a man to trust in his form, but to cast himself wholly upon God.
So then, whether you stand or kneel, whether you lift your hands or bow your head, let this be the matter of concern.
Is your heart laid low before God? Is your will yielded to Him? Do you come as one in need of mercy?
For if these are absent, no posture will avail you. But if these are present, even the simplest cry is received.
Is this not what the Lord has taught?