1. For the Conductor, on the machalat,1 a mas-kil2 by David.
2. The fool says in his heart, "There is no God!" They have acted corruptly and committed abominable deeds; not one does good.
3. God looked down from heaven upon mankind, to see if there was any man of intelligence who searches for God.
4. But they all regressed together; they have become corrupt; there is none who does good, not even one.
5. Indeed, the evildoers who devour My people as they devour bread, who do not call upon God, will come to realize.

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. There they will be seized with fright, a fright such as never was; for God scatters the bones of those encamped against you. You shamed them, for God rejected them.
7. O that out of Zion would come Israel's deliverance! When God returns the captivity of His people, Jacob will exult, Israel will rejoice.