Albert Barnes Commentary Psalms 31:22

"As for me, I said in my haste, I am cut off from before thine eyes: Nevertheless thou heardest the voice of my supplications When I cried unto thee." — Psalms 31:22 (ASV)

For I said in my haste - In my fear; my apprehension. The word rendered “haste” properly means that terror or alarm which causes one to flee, or to attempt to escape. It is not “haste” in the sense of an opinion formed too quickly, or formed rashly; it is “haste” in the sense of terror leading to sudden flight, or an effort to escape. See an illustration of this idea in the case of David himself, in (1 Samuel 23:26).

I am cut off - That is, I will certainly be cut off or destroyed.

From before your eyes - Either, in your very presence; or, so that I will not be admitted into your presence. I will be cut down, and no longer allowed to come before you to worship you. Compare the notes at (Psalms 6:5).

Nevertheless you heard ... - Contrary to my apprehensions, I was heard and delivered. God’s mercy went beyond the psalmist’s faith - as it often does to His people now, far beyond what they hope for; far beyond what they even pray for; far beyond what they believe to be possible; so far beyond all this, as to make the result, as in the case of David (Psalms 31:21), a matter of wonder and astonishment.