愚蠢
The fundamental cause of the trouble is that in the modern world the stupid are cocksure while the intelligent are full of doubt.
The trouble with the world is that the stupid are cocksure and the intelligent are full of doubt.
Humility is the starting point of wisdom, and pride is the endpoint of foolishness.
It is better to be a human being dissatisfied than a pig satisfied； better to be Socrates dissatisfied than a fool satisfied.