These prayers are evidently dictated by the Holy Ghost, because they are founded on God's promises. See Isaiah 43:25; Ezekiel 36:22.
Related Commentaries of Psalms 79:8
Psalms 79:8-9
8 O remember not against us formera iniquities: let thy tender mercies speedily prevent us: for we are brought very low.
9 Help us, O God of our salvation, for the glory of thy name: and deliver us, and purge away our sins, for thy name's sake.