Rewards

Economists have an analysis technique to identify and compare all expenditure and benefits of a given project; cost/benefit analysis. There's a similar energetic rule for interpersonal associations.

If one person has done something such as become healthier, develop new interests or changed what s/he wants in a friendship, then the friendship has to change along.

Has mastery become an old-fashioned notion? Mastery takes time, something most of us have trouble finding. It takes discipline, a quality in short supply today.