John Wasem applies to ministry a rule of thumb learned from Dr. George Calver, the first appointed doctor for the United States Congress:

He was confident that if people would “give 5% of your time to keeping well, then you would not have to give 100% getting over being sick.” I would call it the “5% Rule.”

It’s not an earth-shaking finding, but what works well usually isn’t:

If as church planters we would give 5% of our time – day after day – tending to the health and well-being of our personal lives and ministries, the preventive maintenance would pay huge dividends.