"Who knows when some slight shock," he asks, "disturbing the delicate balance between social order and thirsty aspiration, shall send the skyscrapers in our cities toppling?" ---Lemony Snicket
This saying beautifully demonstrates how terror or more specifically, the unexpected or even can completely ruin plans and even the utmost powerful social sentinels.
"The world is quiet here," and "I didn't realize this was a sad occasion."
These 2 sayings, though not particularly meaningful, are more moving, the more and more you ponder on them.
"...right, temporarily defeated, is stronger than evil triumphant." MLK
Possibly THE wisest saying to ever be spoken by ANYONE. The simplest way to say this is even in stories AND real life is, good will always win, even though it may include sacrifice.