a friend in need is a friend indeed: to help a friend who is in trouble is to be a real friend
great talkers are little doers: people talking and telling others what to do don't often do much themselves
a rolling stone gathers no moss: people changing their minds all the time will never get anything done
birds of a feather flock together: people of the same type stay together
a bird in the hand is worth two in the bush: it is better to enjoy what you already have, than try to get something better
every cloud has a silver lining: even a sad and unpleasant situation has a positive side
all that glitters is not gold: something that may appear as attractive isn't necessarily so
every dog has its day: everybody will feel satisfaction during his/her lifetime
when in Rome, do as the Romans: act the same way as the people around you (especially when traveling abroad)