1) Only one is a wanderer. Two together are always going somewhere.
2) One alone is a wanderer. Two together are going somewhere.
The first sentence is from the famous classic 'Vertigo' by Hitchcock.
I think understand the sentence. But is it grammatical?
How about '2'?
What does 'one' mean in that sentence?
Is that usage natural and idiomatic?
PS. There was a problem with my post. I edited it. I hope it is OK now.