There’s an obvious and vital reason why we humans are so attached to our convictions, and the evidence for this attachment is written all over our history, from the earliest written records to this morning's edition of whatever news media we happen to be consuming now.
It is also is the subject of the very first chapter of the very first published koan collection. Referring to the exchange between Emperor Wu of Liang and the great master Bodhidharma in the aforementioned chapter, Anshi Zachary Smith develops a perspective, informed by zen teachings, on knowing and not-knowing.