9803. From all this it is evident that being intelligent and wise does not consist in understanding a great number of worldly matters and being wise about them, but in understanding those that belong to heaven and willing them. For there are people who understand and are wise about a great number of worldly matters, and yet have no belief in things which belong to heaven and do not will them, and for this reason are insane. These are the ones the Lord is talking about when He says in Matthew,

I speak by means of parables, because those who see do not see, and those who hear do not hear, nor do they understand. Matthew 13:13.

And in John,

The world cannot receive the Spirit of truth, because it neither sees Him nor knows Him. John 14:17.