"… I have never seen a (permanent) specimen. I think he has never lived. But I have seen several entirely sincere people who thought they were (permanent) Seekers after the Truth. They sought diligently, persistently, carefully, cautiously, profoundly, with perfect honesty and nicely adjusted judgment- until they believed that without doubt or question they had found the Truth. That was the end of the search. The man spent the rest of his life hunting up shingles wherewith to protect his Truth from the weather."
– Mark Twain, What is Man?