不易之論

perfectly sound proposition / unalterable truth / irrefutable argument

no; not so / (bound form) not; un-

not easy to do sth / difficult / unchanging

easy / amiable / to change / to exchange / prefix corresponding to the English adjective suffix "-able" or "-ible" / abbr. for 易經|易经[Yi4 jing1], the Book of Changes

(possessive particle, literary equivalent of 的[de5]) / him / her / it

abbr. for 論語|论语[Lun2 yu3], The Analects (of Confucius)

opinion / view / theory / doctrine / to discuss / to talk about / to regard / to consider / per / by the (kilometer, hour etc)