One of my clients is Kiewit (large construction and mining) which is this year celebrating its 125th anniversary. Peter Kiewit, who provided legendary leadership in growing the company, used the phrase “pleased but never satisfied.”
I’ve embraced a similar philosophy I call “positive discontent.” Be positive about what you’ve accomplished but don’t become content. Keep pushing to make your best better.
It applies to those you manage as well. Appreciate and congratulate people on their accomplishments but challenge them not to rest on their laurels.