General Information:

The person who composed this psalm continues to speak.

in the land of the living

"in this world where people are alive." This is in contrast to the place of the dead.

This can be stated in active form. AT: "I suffer greatly" or "People afflict me very much" (See: rc://en/ta/man/translate/figs-activepassive)

"I said too quickly" or "I said without considering"

"Every person is a liar" or "All people are liars"