The issue with someone who is a "know-it-all" is that she / he thinks there is nothing else to learn. Thus the crux of the downfall and future hindrance.

Some things do not change, but many things change. Some at a faster pace than others. Past knowledge is often clouded by personal biases which can lead to wrong inferences.

It is better to acknowledge that my past knowledge can be obsolete and so I need to always update myself. And be humble.

Even as it relates to God. God does not change, but my understanding of him evolves. And I thank him for that.

Related: Not know-it-all