Noun
a particular way of thinking that is characteristic of some individual or group
Source: WordNetBut the line of thought that I'd been chasing for several days was implicit in the ruins of the old Roman Empire, which gradually destroyed itself by substituting the faith in a legion of miraculous words for the strength of armies and the weight of walls. Lewis H. Lapham
I think that when we start thought-policing people and idea-policing people, then that's crossing a line. And I think, you know, everybody's so afraid of this imaginary line of thought police that they forget their own personal safety. Ashton Kutcher