All 3 Uses of

doctrine

in

An Enemy of the People

That is, the doctrine you have inherited from your forefathers and proclaim thoughtlessly far and wide—the doctrine that the public, the crowd, the masses, are the essential part of the population—that they constitute the People—that the common folk, the ignorant and incomplete element in the community, have the same right to pronounce judgment and to, approve, to direct and to govern, as the isolated, intellectually superior personalities in it.†
Act 4 *

That is, the doctrine you have inherited from your forefathers and proclaim thoughtlessly far and wide—the doctrine that the public, the crowd, the masses, are the essential part of the population—that they constitute the People—that the common folk, the ignorant and incomplete element in the community, have the same right to pronounce judgment and to, approve, to direct and to govern, as the isolated, intellectually superior personalities in it.†
Act 4

That is why I maintain that it is absolutely inexcusable in the "People's Messenger" to proclaim, day in and day out, the false doctrine that it is the masses, the crowd, the compact majority, that have the monopoly of broad-mindedness and morality—and that vice and corruption and every kind of intellectual depravity are the result of culture, just as all the filth that is draining into our Baths is the result of the tanneries up at Molledal!†
Act 4

Definition:

(doctrine)
a belief (or system of beliefs or principles) accepted as authoritative by some group