Augustine of Hippo
In other words, it is not through the vocalizations of the body, which arise from the reverberations of the air, but rather through the voice of the heart, which communicates not with humanity but with God as an earnest plea. It is with this voice that Susanna was acknowledged; and it is with this same voice that the Lord instructed us to pray in secluded places, as stated in Matthew 6:6, referring to the depths of the heart in silence.
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It would be challenging to assert that prayer is absent when this inner voice does not produce audible words from the body; for even when we pray quietly in our hearts, if distracting thoughts invade the mind of the supplicant, one cannot rightly claim, "With my voice have I cried unto the Lord." This assertion holds true only when the soul, disengaging from bodily concerns and earthly desires, genuinely communicates with God in prayer, where only He can listen. Yet, this is also regarded as a cry based on the vigor of its intent. And He heard me from His holy mountain. The Lord Himself is referred to as a mountain by the prophet, as written, "A stone hewn without hands grew to the size of a mountain" (Dan. 2:34-35). However, this should not be interpreted as separate from His Being; rather, it reflects His presence within me, as He listened from His holy mountain, which resides in my very being. This understanding becomes clearer and more comprehensible when we recognize that God, in His righteousness, listened. It was fitting for Him to resurrect the Innocent One, who was wrongfully slain, as He had received evil in exchange for good, thus providing the persecutor with the just recompense for responding with malevolence. For we read, "Thy justice is as the mountains of God."