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“Good is the enemy of great. And that is one of the key reasons why we have so little that becomes great. We don't have great schools, principally because we have good schools. We don't have great government, principally because we have good government. Few people attain great lives, in large part because it is just so easy to settle for a good life.”
― Jim Collins, Good to Great: Why Some Companies Make the Leap... and Others Don't

“In a distributed system, it is insufficient to believe that a server is down because another server says so. Usually, it requires at least two independent sources of information to mark a server down.”
― Alex Xu, System Design Interview �� An insider's guide