Te Deum Laudamus

I remember once when I was in church with my father (beginning of 50s?) and heard this music. I thought the organ would expload The fortissimo came so suddenly. Everyone stepped up and it was a solemn moment. Found  now out that it’s composed 1889 by F R Faltin, Finnish composer. After some searching in my city library, they found the old chorale book for me in the library's storage room.
In my registration, I have a softer part, where the text is about Lamb of God.