my heart
The Hebrew word for "heart" is "לֵב" (lev), which in biblical terms often refers not just to the physical heart but to the center of one's inner life, including emotions, thoughts, and will. In ancient Hebrew culture, the heart was seen as the seat of understanding and decision-making. The psalmist's reference to the heart being glad indicates a deep, internal joy that transcends circumstances, rooted in a profound trust in God.

is glad
The phrase "is glad" comes from the Hebrew root "שָׂמַח" (samach), which means to rejoice or be joyful. This joy is not superficial but is a deep-seated happiness that arises from a sense of security and well-being in God's presence. The psalmist's gladness is a reflection of the confidence and peace that come from a life aligned with God's will and purposes.

and my tongue
The Hebrew word for "tongue" is "כָּבוֹד" (kavod), which can also mean "glory" or "honor." In this context, it likely refers to the psalmist's speech or expression. The tongue is often seen as an instrument of praise and declaration. The psalmist's use of the tongue to express joy underscores the importance of verbalizing one's faith and gratitude, which is a common theme throughout the Psalms.

rejoices
The word "rejoices" is derived from the Hebrew "גִּיל" (gil), which conveys a sense of exultation and triumph. This rejoicing is an outward expression of the inner gladness mentioned earlier. It suggests a celebratory response to God's faithfulness and provision, highlighting the psalmist's exuberant praise and acknowledgment of God's goodness.

my body
The term "body" in Hebrew is "בָּשָׂר" (basar), which refers to the physical flesh. In this verse, it signifies the entirety of the psalmist's being, encompassing both physical and spiritual aspects. The mention of the body indicates that the joy and security experienced by the psalmist are holistic, affecting both the soul and the physical self.

also
The word "also" serves to include the body in the experience of joy and security, emphasizing that the psalmist's entire being is involved in this state of blessedness. It suggests that the benefits of faith and trust in God are not limited to the spiritual realm but extend to the physical and material aspects of life as well.

will dwell
The phrase "will dwell" comes from the Hebrew "שָׁכַן" (shakan), which means to reside or settle. It conveys a sense of permanence and stability. The psalmist's confidence that his body will dwell securely reflects a trust in God's ongoing protection and provision, both in this life and beyond.

securely
The word "securely" is translated from the Hebrew "לָבֶטַח" (labetach), which means in safety or confidence. This term underscores the assurance and peace that come from being under God's care. The psalmist's declaration of dwelling securely is a testament to the unwavering trust in God's promises and the peace that surpasses understanding, which is available to all who place their faith in Him.

Shall rest in hope.--This follows the Vulg. The LXX. also have "shall tabernacle in hope." The true rendering, however, is shall rest in security. In "heart, soul, flesh," the poet comprises the whole living man. (Comp. 1Thessalonians 5:23.) The psalmist feels that the body must share with the soul the immunity from evil which is insured by fellowship with God. Carried out to its full issue, the logical conclusion of this is the doctrine of immortality; but we must not see a conscious reference to it here.