I thirst for God

The author speaks of his strong desire for God as if it were a strong thirst for water. (See: rc://en/ta/man/jit/figs-metaphor)

when will I come and appear before God?

The author does not ask this question to get an answer but to show his strong desire to be before God. (See: rc://en/ta/man/jit/figs-rquestion)