I often find that people either underestimate what they know, or overestimate it. Very rarely do they gauge their own knowledge appropriately.
We ought to, as human beings, have the courage to seek a collective “truth” that benefits our species the most, and to accept that all of our doctrines and beliefs may just be incomplete. That we don’t know it all and that perhaps we never will. That others like us may have something to teach us, and we may have something to contribute to their communities. That communities, types of people, are divisions we’ve created for ourselves. That for all of what we know, the knowledge and wisdom that we have gathered in the few millennia may be a small fraction of what is there to be discovered, understood and applied.