That's a pretty difficult question... because you stole my answer :)

Actually, it does my heart good to know that song has had an impact on you. It's so full of grace.

Honestly, something hit me the first time I realized what I was singing during "How Firm a Foundation". That was a relatively recent occurrence. But "Be Thou My Vision" has always had a profound effect on me as well. Of newer, rewritten stuff, I really enjoy "O Love that Will Not Let Me Go" and "On Jordan's Stormy Banks I Stand".

I'm not sure if there's a common thread there or not. Thanks for asking!

-Zack