Non-native speaker here. Be kind :)
From TLOTR Book 1, Chapter 7, "In the house of Tom Bombadil"
'Let us shut out the night!' she said. `For you are still afraid, perhaps, of mist and tree-shadows and deep water, and untame things. Fear nothing! For tonight you are under the roof of Tom Bombadil.'
I have doubts about the exact meaning of "for" in the previous sentences.
I believe the first time it indicates causation. Something like "Because you are still afraid ...". Am I right?
The second one is more difficult for me. In this case, it could be causation (the reason why the hobbits should not fear is that they are in a safe place), or just used to set a specific time (tonight) like in "For now we see through a glass, darkly; but then face to face". Which one is correct?