I often turn to Peirce not just for technical philosophical matters but also for insights like this one. What sort of people am I interested in surrounding myself with? It is most comfortable to surround myself with people who share my views and who espouse them with the air of certainty. But as Peirce reminds us in "The Fixation of Belief," the great danger there is that in so doing I cut myself off from seeing my own errors and from improving my thinking.
As with so many things worth remembering, it is hard to keep this in mind. We need not just people who think differently from the way we think but also communities that will help us return to those words and ideas that sharpen us and provoke us to thought. This is the challenge of theology and of philosophy, and of liturgies, both sacred and secular - to remind us of what we ought to remember while at the same time challenging us to resist the comfort of resting in what seems sure. As Augustine writes, "Our hearts are restless until they find their rest in thee, O Lord." Until then, until our hearts find rest in the absolute, we should be wary of certainty, which is so often the enemy of learning.