In this case, in your opinion, is what these people would be committing basically the same as the fundamental "error" that Orthodoxy attributes to Papal infallibility?
I don't think so.
I think what Yannaras is talking about is "plani" or "prelest", that is, "spiritual delusion" in the form of an "attack from the right". This is a passion monastics are particularly prone to. In "An Athonite Gerontikon"
, the phenomenon is described well with examples. An "attack from the right" refers to the demonic temptation to evil through an apparent good
. This is contrasted with "an attack from the left" in which there is a temptation to do something overtly evil
. An example of "an attack from the left" would be to covet something and steal it. An example of "an attack from the right" where an apparent good is used to lure a soul into sin is given in the Gospel when Christ says to His Disciples: "They will put you out of the synagogues; yes, the time is coming that whoever kills you will think that he offers God service." (John 16:2)
For this reason, Christ also warned that many on the Day of Judgement will be astounded to find thay are not among the Saints: "Many will say to Me in that day, ‘Lord, Lord, have we not prophesied in Your name, cast out demons in Your name, and done many wonders in Your name?’ And then I will declare to them, ‘I never knew you; depart from Me, you who practice lawlessness!’" (Matthew 7;22-23)
. A common "attack from the right" which many, unfortunately, fall into is "zeal without love"
. While zeal itself is a good, zeal without love is demonic. One often finds this in "Netodoxy"- people who are convinced that they hold "The TruthTM
" and anyone who disagrees with them is an enemy bent on destroying the Church. What is astounding is that these people will tear the Church apart in their efforts to "prove" they are correct with the result of schism
- which is worse than any heresy anyway.
This is quite different to the notion of Papal Infallibility. In Papal Infallibility, there is an appeal to authority
(ie. the authority of the Magisterium) as it's basis, rather than a deluded appeal to "The TruthTM