Another good one from Ev Williams, on Inside Medium:

The job of leadership is to foster alignment and enthusiasm toward the right goal.

Alignment: A collection of good people does not make a good team if they’re not pushing in the same direction. Constant communication and adjustment is needed.

Enthusiasm: You’re doing something hard and against the odds. The only way to do this type of thing is to have a (realistic) positive attitude and inspire confidence.

The right goal: Where are we going? Is it big enough, but accomplishable? Is it still correct based on current data? How do we know if we’re making progress? These are questions you must constantly ask.