Day 3: A song / poem you know by heart and will never forget.

I know many songs by heart, but one that have never skipped my mind is a song from the Bible. It's from the book of Psalms, and was written by David, the man after God's own heart. It goes like this:

I've known this verse since 6th grade, and it's been - what - almost 9 years since then? I still remember this verse, and somehow, whenever time calls for this verse to be remembered, it snaps back into place in my head.