Sentence:  […] his religion, his worship was like his daily bread to him; — which he did not take the trouble to talk much about; which he merely ate at stated intervals, and lived and did his work upon! This is Abbot Samson's Catholicism of the Twelfth Century; — something like the <WSD>"Ism</WSD>" of all true men in all true centuries, I fancy! Alas, compared with any of the "Isms" current in these poor days, what a thing! 
Meaning of the word marked with <WSD> tags:  An ideology, system of thought, or practice that can be described by a word ending in -ism.