In some ways, nothing is more humbling than reality itself. A proud man must in some measure be deluded about his own nature, the nature of God, the nature of sin, or the nature of truth itself. Nevertheless, merely knowing the facts about everything would most likely serve to ENHANCE a person's pride! This reveals the practical invincibility of this foundational vice: it is immune to the light that should rightly vanquish it. Knowledge puffs up the very soul that ought to be humbled by it.
So, what can possibly slay the self-regenerating root of pride? Only this: experiencing the mercy of God. The soul that experiences utter dependence on God's sheer kindness - and finds itself undeservedly shielded from His wrath - has a genuine hope of being freed from the straitjacket of pride. The person who daily and gratefully receives the gift of grace is being taught real humility. This person is the one who can benefit from a wider knowledge of the truth and the reality of things.
The very skies and fields and trees look different when once you have found yourself flat on your back, defeated and desperate, and then have felt the extended hand of healing mercy laying gentle on your shoulder. God gives grace to the humble, indeed, but it is all by grace He makes us humble.
"Now I, Nebuchadnezzar, praise and extol and honor the King of heaven, for all his works are right and his ways are just; and those who walk in pride he is able to humble."
- Daniel 4:37