In the school of knowledge, there is no graduation.
The more you know, the more you discover you are yet to know. 1 Corinthians 8:2.
Real knowledge always gives room for more knowledge, this is why no new knowledge can sustain itself.
By tomorrow, it has become outdated, archaic, and old-fashioned.
Every given knowledge is only for a season.
So, with every passing season, there is a fading effect on the knowledge of that season, requiring urgent renewal.
Therefore, give room for improvement on a daily basis if you don’t want to become outdated. Let him that thinks he knows a thing know that he does not know yet as he ought to know.