A Psalm of David. Plead my {a} cause, O LORD, with them that strive with me: fight against them that fight against me.

(a) He desires God to undertake his cause against them who persecute him and slander him.Psalm 35:1 Parallel Commentaries

The Ninth Commandment
Thou shalt not bear false witness against thy neighbour.' Exod 20: 16. THE tongue which at first was made to be an organ of God's praise, is now become an instrument of unrighteousness. This commandment binds the tongue to its good behaviour. God has set two natural fences to keep in the tongue, the teeth and lips; and this commandment is a third fence set about it, that it should not break forth into evil. It has a prohibitory and a mandatory part: the first is set down in plain words, the other …
Thomas Watson—The Ten Commandments

Question of the Comparison Between the Active and the Contemplative Life
I. Is the Active Life preferable to the Contemplative? Cardinal Cajetan, On Preparation for the Contemplative Life S. Augustine, Confessions, X., xliii. 70 " On Psalm xxvi. II. Is the Active Life more Meritorious than the Contemplative? III. Is the Active Life a Hindrance to the Contemplative Life? Cardinal Cajetan, On the True Interior Life S. Augustine, Sermon, CCLVI., v. 6 IV. Does the Active Life precede the Contemplative? I Is the Active Life preferable to the Contemplative? The Lord …
St. Thomas Aquinas—On Prayer and The Contemplative Life

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