Therefore my heart is glad, and my glory rejoiceth: my flesh also shall rest in hope.
Therefore - because the Lord is at my right hand.
My heart is glad - in the assurance of perfect deliverance.
And my glory rejoiceth - "my glory," i:e., my soul, the most honourable part of man. Rather, 'my tongue,' as it is explained by the apostle, in accordance with the Septuagint, Acts 2:26. So Psalms 30:12, margin; 57:8; 108:1. The tongue is the glory of man above the brutes; it is the soul's interpreter, whence it derives its "glory." It is also the instrument of glorifying God, which is man's highest glory. David not only exults internally, but makes his tongue and flesh also partakers of his joy.
My flesh also shall rest in hope - rather, 'shall dwell х yishkon (H7931)] in security,' or 'safety,' as the Hebrew х laabeTach (H983)] is translated in Psalms 4:8. The English version, however, has a right idea; the Hebrew is derived from a root, to be confident х baaTach (H983)]. Confidence is akin to hope. It is the Christian hope-not vague, but sure; God, its object, is true and faithful. That the phrase, 'my flesh shall dwell in confident security,' refers in the ulterior sense to Messiah's body resting secure in the grave, appears from Isaiah 26:19; Acts 2:26. Hengstenberg denies that "flesh" is used of the soulless body, and says it means only the living body. But the phrase may probably be used in the case of Christ, as His body, though the soul was severed from it at death, yet remained like a living body, exempt from corruption. In the primary and imperfect sense in which David, as the type, used the words, he may have intended only to express his confident hope of deliverance from his imminent dangers. Thus, "the pains of hell" (Sheol or Hades) are used of the greatest straits, in Psalms 116:3; or his hope that he should not be given over to ruin (cf. the use of hell, Matthew 11:23); and that he, as a saint of God, should not see corruption, or destruction (as the same Hebrew is translated, Psalms 107:20), or the pit (Ezekiel 19:4, Hebrew). But the Spirit, by him (1 Peter 1:10-12), used language which has its full and mainly designed accomplishment only in Christ's resurrection from the grave and ascension to heaven, and in the resurrection and ascension of all believers hereafter through Him (Romans 8:19).