Christ in the Psalms--Psalm 4

Know also that the Lord hat made wondrous His holy one; the Lord will hearken unto me when I cry unto Him.--Psalm 4, HTM translation

The Hebrew term here, translated as "godly" [i.e. holy one] is hasid(hosios in the Greek, sanctus in the Latin). That is to say, the life in Christ is the life of the "holy ones," the hasidim; it is the "hasidic" life, the life of separation from the sinful standards of the world. The adjective, hasid is used in the Hebrew Old Testament 32 times, of which 21 are found in the Book of Psalms, a proportion strongly suggesting that the prayer and praise of God are a major component of the biblical doctrine of holiness. One cannot live a worldly life and still expect to be able to pray the psalms. The Psalter has nothing to say to the worldly; it is not for the unconverted, the unrepentant. It is, rather, the prayer book of those who strive for holiness of life and the unceasing praise of God.--Fr. Patrick Reardon, Psalm 4, Christ in the Psalms