school of thought
https://gyazo.com/dd08a7c1152a27170f6e32740a2b1716
source: By Fyodor Bronnikov, (1827—1902) - http://john-petrov.livejournal.com/939604.html?style=mine#cutid1, Public Domain
school of thought
a particular way of thinking, typically one disputed by the speaker:
(学問・芸術の)流派, …派, 学派; 考え方
e.g. a school of thought that calls into question the constitutional foundations of this country.