I’ve just spotted some great quotes from a discussion going on over at Proz:
My own experience and the previous posts remind me of an old Hungarian saying: ‘You are as many persons as the languages you speak’. I came across a similar Slovak saying recently…‘The more languages you know, the more of a person you are.’…
[Elizabeth Rudin, 2006: my emphasis]
Read the rest of the discussion on what it’s like to have different “personalities” when you speak another language here.