1. For the Conductor, with instrumental music, a psalm by David.
2. Answer me when I call, O God [Who knows] my righteousness. You have relieved me in my distress; be gracious to me and hear my prayer.
3. Sons of men, how long will you turn my honor to shame, will you love vanity, and endlessly seek falsehood?
4. Know that the Lord has set apart His devout one; the Lord will hear when I call to Him.
5. Tremble and do not sin; reflect in your hearts upon your beds, and be silent forever.

Tehillim Ohel Yoseph Yitzchok (Kehot Publication Society)

Tehillim is recited by Jewish people collectively and individually, as the desire occurs to offer praise and thanksgiving to G-d; or alternitavely, in times of crisis and need, as a form of supplication, and even as a venue to express regret for sin.

6. Offer sacrifices in righteousness, and trust in the Lord.
7. Many say: “Who will show us good?” Raise the light of Your countenance upon us, O Lord.
8. You put joy in my heart, greater than [their joy] when their grain and wine abound.
9. In peace and harmony I will lie down and sleep, for You, Lord, will make me dwell alone, in security.