Word : Ultra posse nemo obligatur
Origin : Latin.
Meaning : One shall do what he can do to support the community. That means, nobody is obligated to do more than what he can do.
Explanation : Everyone has his own level of ability to do a particular thing and one cannot expect that all will perform at same level.
Word : Uno flatu
Origin : Latin.
Meaning : Used to criticize inconsistencies in a speech.
Explanation : Some people say one thing, and in the same breath, says another thing which is contradictory.