1. By David. Blessed be the Lord, my Rock, Who trains my hands for battle and my fingers for war.
2. My source of kindness and my fortress, my high tower and my rescuer, my shield, in Whom I take refuge; it is He Who makes my people submit to me.
3. O Lord, what is man that You have recognized him; the son of a mortal, that You are mindful of him?
4. Man is like a breath; his days are like a passing shadow.
5. O Lord, incline Your heavens and descend; touch the mountains and they will become vapor.

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. Flash one bolt of lightning and You will scatter them; send out Your arrows and You will confound them.
7. Stretch forth Your hands from on high, rescue me and deliver me out of many waters, from the hand of strangers,
8. whose mouth speaks deceit and whose right hand is a right hand of falsehood.
9. God, I will sing a new song to You, I will play to You upon a harp of ten strings.
10. He who gives victory to kings, He will rescue David, His servant, from the evil sword.
11. Rescue me and deliver me from the hand of strangers, whose mouth speaks deceit and whose right hand is a right hand of falsehood.
12. For our sons are like plants, brought up to manliness in their youth; our daughters are like cornerstones, fashioned after the fashion of a palace.
13. Our storehouses are full, overflowing with all manner of food; our sheep increase by the thousands, growing by the tens of thousands in our open fields.
14. Our leaders bear the heaviest burden; there is none who break through, nor is there bad report, nor outcry in our streets.
15. Happy is the nation for whom this is so. Happy is that nation whose God is the Lord.