"Thou Shalt Honor Thy Father and Thy Mother. "
From this Commandment we learn that after the excellent works of the first three Commandments there are no better works than to obey and serve all those who are set over us as superiors. For this reason also disobedience is a greater sin than murder, unchastity, theft and dishonesty, and all that these may include. For we can in no better way learn how to distinguish between greater and lesser sins than by noting the order of the Commandments of God, although there are distinctions also within the …
Dr. Martin Luther—A Treatise on Good Works

What the Ruler's Discrimination Should be Between Correction and Connivance, Between Fervour and Gentleness.
It should be known too that the vices of subjects ought sometimes to be prudently connived at, but indicated in that they are connived at; that things, even though openly known, ought sometimes to be seasonably tolerated, but sometimes, though hidden, be closely investigated; that they ought sometimes to be gently reproved, but sometimes vehemently censured. For, indeed, some things, as we have said, ought to be prudently connived at, but indicated in that they are connived at, so that, when the …
Leo the Great—Writings of Leo the Great

Epistle Xlvi. To Isacius, Bishop of Jerusalem .
To Isacius, Bishop of Jerusalem [159] . Gregory to Isacius, &c. In keeping with the truth of history, what means the fact that at the time of the flood the human race outside the ark dies, but within the ark is preserved unto life, but what we see plainly now, namely that all the unfaithful perish under the wave of their sin, while the unity of holy Church, like the compactness of the ark, keeps her faithful ones in faith and in charity? And this ark in truth is compacted of incorruptible timber, …
Saint Gregory the Great—the Epistles of Saint Gregory the Great

Letter xxxiv. To Marcella.
In reply to a request from Marcella for information concerning two phrases in Ps. cxxvii. ("bread of sorrow," v. 2, and "children of the shaken off," A.V. "of the youth," v. 4). Jerome, after lamenting that Origen's notes on the psalm are no longer extant, gives the following explanations: The Hebrew phrase "bread of sorrow" is rendered by the LXX. "bread of idols"; by Aquila, "bread of troubles"; by Symmachus, "bread of misery." Theodotion follows the LXX. So does Origen's Fifth Version. The Sixth …
St. Jerome—The Principal Works of St. Jerome

Psalms
The piety of the Old Testament Church is reflected with more clearness and variety in the Psalter than in any other book of the Old Testament. It constitutes the response of the Church to the divine demands of prophecy, and, in a less degree, of law; or, rather, it expresses those emotions and aspirations of the universal heart which lie deeper than any formal demand. It is the speech of the soul face to face with God. Its words are as simple and unaffected as human words can be, for it is the genius …
John Edgar McFadyen—Introduction to the Old Testament