Time: Make the most of what you have.
Normally expressed as “I don’t have enough time.” Michael Bolton wrote on this topic from a testers perspective.
Rapid testers are a service to the product, not an obstacle. We keep providing service until the client is satisfied. That means, for me, that there’s never “not enough time to test”; any amount of time is enough for me. The question isn’t whether the tester has enough time; the question is whether the client has enough information–and the client gets to decide that.
See Embrace The Possible for more info.