Words not kept break more than a promise.
Passion isn't always available. The committed get things done even without it.
Your promise means more than the words you use to give it.
Compromise in your arguments, not in your expectations.
When customers' expectations change faster than your willingness or ability to serve them, you can be sure they'll be someone else's customers soon.
What's possible today isn't bound by what was possible yesterday, and is never a measure of what's possible tomorrow.