One lesson is don’t leap to conclusions just because they seem obvious.
As living entities we ALL suffer from the four defects:
“The words spoken by the Lord are called apauruseya, meaning that they are different from words spoken by a person of the mundane world who is infected with four defects. A mundaner (1) is sure to commit mistakes, (2) is invariably illusioned, (3) has the tendency to cheat others and (4) is limited by imperfect senses.”
These illusions demonstrate how imperfect our senses are.