In other words don't expect to always be great. Disappointments failures and setbacks are a normal part of the lifecycle of a unit or a company and what the leader has to do is constantly be up and say 'we have a problem let's go and get it'.
When a great team loses through complacency it will constantly search for new and more intricate explanations to explain away defeat.
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It is the mark of a great man that he puts to flight all ordinary calculations. He is at once sublime and touching childlike and of the race of giants.