Proverbs 15:3

4. But let our speech and petition when we pray be under discipline, observing quietness and modesty. Let us consider that we are standing in God’s sight. We must please the divine eyes both with the habit of body and with the measure of voice. For as it is characteristic of a shameless man to be noisy with his cries, so, on the other hand, it is fitting to the modest man to pray with moderated petitions. Moreover, in His teaching the Lord has bidden us to pray in secret, in hidden and remote places, in our very bed-chambers, which is best suited to faith, that we may know that God is everywhere present, and hears and sees all, and in the plenitude of His majesty penetrates even into hidden and secret places, as it is written, “I am a God at hand, and not a God afar off. …

In the Wisdom of Solomon: “In every place the eyes of God look upon the good and evil.” Also in Jeremiah: “I am a God at hand, and not a God afar off. If a man should be hidden in the secret place, shall I not therefore see him? Do not I fill heaven and earth? saith the Lord.” Also in the first of Kings: “Man looketh on the face, but God on the heart.” Also in the Apocalypse: “And all the churches shall know that I am the searcher of the reins and heart; and I will give to every one of you according to his works.” Also in the eighteenth Psalm: “Who understands his faults? Cleanse Thou me from my secret sins, O Lord.” Also in the second Epistle of Paul to the Corinthians: “We must all be manifested before the tribunal of Christ, that every one may bear again the things which belong to his own body, according to what he hath done, whether good or evil.”