I watch this vid every couple of days and it never fails to get me pumped up. Some of my favorites:
"It matters or we're not doing it."
"Get better every day."
"Melt towards that angle, don't just go running out." Addresses a key issue we had.
"Don't ooze off the ball."
And my favorite:
"NEVER PLAY HIGH, NEVER PLAY HIGH."
With the attention to fundamentals, we can't help but be better defensively. No matter how talented you are, you'll never be a great defensive team if you aren't fundamentally sound. And we don't have the talent that many teams do so it's even more imperative that we master the fundamentals.