In Ultima VII, Alagner, who was said to be the wisest man in all of Britannia, had a very insightful analysis of the principles known as the Triad of Inner Strength being endorsed by the Fellowship and had this to say about them in his notebook:

Strive for Unity

This implies that the Fellowship considers itself an élite and prejudicial group. That implies that the Fellowship believed, just as the present United States under George W. Bush after the disaster of September 11, 2001 does, that if you are not for them, then you are against them. Now where would you be if you were against them...

Trust thy Brother

The hidden subtext in this principle that the Fellowship promotes is obedience without question: trust your brother regardless of what that might imply.

Worthiness Precedes Reward

If one does good deeds for the Fellowship, one will be rewarded for it, but of course if one does not do that, then one will get a reward as well... Rewards can be both good or bad.

And Alagner concludes in his study of the Fellowship:

...After careful study, I have come to the conclusion that the group is serving some higher, malevolent entity, referred to by the organization's inner circle as 'The Guardian'...

Source: Alagner's notebook in New Magincia from Ultima VII. Play the game till you reach the Wisps.