Strength of will - is essential to your survival and success. The competitor who won't go away, who won't stay down, has one of the most formidable competitive advantages of all. In evaluating people, I prize ego. It often translates into a fierce desire to do their best and an inner confidence that stands them in good stead when things really get rough. Psychologists suggest that there is a strong link between ego and competitiveness. All the great performers I've ever coached had ego to spare.

Flying by the seat of your pants precedes crashing by the seat of your pants.

My theory is that, just like with omitting a final comma in a list when not essential for meaning, publishers are trying to save paper and ink or pixels on-screen.

On occasion I omit commas. On occasion, I use them. (The more you know about English, the less you're likely to think there are unbreakable "rules" for a lot of these things.)

Champions behave like champions before they are champions

Nothing is more effective than sincere, accurate praise.

"Extra effort," in whatever form it takes (mental, physical, emotional), cannot be sustained without eventual damage and diminishing returns. There has to be a very acute awareness on your part as to the level of exertion and the toll it's taking on those you lead.