Henry Cloud — American Psychologist

Henry Cloud, PhD is an American Christian self help author. Cloud co-authored Boundaries: When to Say Yes, How to Say No to Take Control of Your Life in 1992 which sold two million copies and evolved into a five-part series... (wikipedia)

If you are building a culture where honest expectations are communicated and peer accountability is the norm, then the group will address poor performance and attitudes.
Everything has seasons, and we have to be able to recognize when something's time has passed and be able to move into the next season. Everything that is alive requires pruning as well, which is a great metaphor for endings.
Leaders set a very clear path every day, in a thousand different ways, of what the people must attend to, inhibit, and keep it current in front of them.
Don't use all-or-nothing thinking. Take each day as its own day, and don't worry about it if you mess up one day. The most important thing you can do is just get back up on the horse.
Physical presence provides chemical, relational, psychological and physiological effects that virtual relationships cannot. Our brains change in the presence of another person and their behavior.