Blessedness and Praise
'Blessed is the man that walketh not in the counsel of the ungodly, nor standeth in the way of sinners, nor sitteth in the seat of the scornful. 2. But his delight is in the law of the Lord.' --PSALM i. 1, 2. 'Let every thing that hath breath praise the Lord. Praise ye the Lord.'--PSALM cl. 6. The Psalter is the echo in devout hearts of the other portions of divine revelation. There are in it, indeed, further disclosures of God's mind and purposes, but its especial characteristic is--the reflection …
Alexander Maclaren—Expositions of Holy Scripture

Epistle xxxii. To Anastasius, Presbyter .
To Anastasius, Presbyter [1714] . Gregory to Anastasius, &c. That a good man out of the good treasure of his heart bringeth forth good things (Matth. xii. 35; Luke vi. 45), this thy Charity has shewn, both in thy habitual life and lately also in thy epistle; wherein I find two persons at issue with regard to virtues; that is to say, thyself contending for charity, and another for fear and humility. And, though occupied with many things, though ignorant of the Greek language, I have nevertheless sat …
Saint Gregory the Great—the Epistles of Saint Gregory the Great

How those that are at Variance and those that are at Peace are to be Admonished.
(Admonition 23.) Differently to be admonished are those that are at variance and those that are at peace. For those that are at variance are to be admonished to know most certainly that, in whatever virtues they may abound, they can by no means become spiritual if they neglect becoming united to their neighbours by concord. For it is written, But the fruit of the Spirit is love, joy, peace (Gal. v. 22). He then that has no care to keep peace refuses to bear the fruit of the Spirit. Hence Paul …
Leo the Great—Writings of Leo the Great

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