I came across this text in “Motivating Yourself – Heroes, Role Models & Rivals” which links to the source at Embrace Constraints (37signals)

Let limitations guide you to creative solutions
There’s never enough to go around. Not enough time. Not enough money. Not enough people.

That’s a good thing.

Instead of freaking out about these constraints, embrace them. Let them guide you. Constraints drive innovation and force focus. Instead of trying to remove them, use them to your advantage.

This was originally posted at another (now extinct) blog of mine.