MrOli,
what you're proposing is something called Linguistic Determinism, which was popular in the 60s, but which is losing favour now as it turns out we can think without language, as strange as that might seem. We tend to construct our train of thought around a linguistic framework, but most of what we actually think is on a subconscious level. Personally I would say that language is shaped by thought much more than the other way round.
Edit: Also monkeys DO think. They just don't have language.
( Zuowan, Sat 6 Dec 2008, 19:51, Reply)