taken for granted
It means that the reason is of course like this. It means that what happens in reason is reasonable and can not be doubted.
The origin of Idioms
Wang Tong's Wenzi weixiangpian in Sui Dynasty: "it's not debate, but reason is ear.". "
Idiom usage
Subject predicate; predicate, attribute, adverbial; commendatory
Examples
It's natural that good people are blessed and evil people are harmed. ——Zhao Bi in Ming Dynasty
taken for granted
a large head and big ears -- sign of a prosperous man - féi tóu dà miàn
be confused like a tangle of flax - máng wú duān xù
become wiser after being duped - shàng dāng xué guāi
The old road is not the same as the old one - shú lù qīng zhé