Mastery and Knowledge

What good is knowledge if we don't apply it?

For the righteous fall seven times and rise again, but the wicked stumble in times of calamity. Proverbs 24:16 ESV

The sting of failure cuts like a whetted knife. The butterflies in your stomach turn to fear, then to rage, then to disbelief. Dizziness. What does it mean? How can I have failed? And on something so stupid? The examiner was wrong. He must b…