Mottos (or should that be motti?)

Gordon Brown has stated that he will be governed by his old school motto, which he gave as "I will try my utmost". I assume this is how he remembers it being told to him when he was at school, but the motto is actually "usque conabor", which my (admittedly very rusty) recollection of latin suggests actually means something like "always try hard" or "strive to the end". Just to confuse the issue, the school themselves render it these days as "working together to improve". Don't quite see where they get that from though!