Be Still My Soul. I can't always believe in God and when I can, I can't always praise him for everything in the world. But even listening myself to Be Still My Soul, I feel that there must be a God who is also listening.
To Be A Pilgrim. I prefer John Bunyan's original lyrics to the English Hymnal, i.e.
"Hobgoblin nor foul fiend can daunt his spirit".
I also like Immortal, Invisible, God Only Wise and Oh Worship the King, All Glorious Above. It may be partly because both refer to God as The Ancient of Days and I like that name.