Stephen tells us that our greatest asset we will ever have is ourselves. He tells us that if we don’t take the time to renew/work on ourselves than we’re going to run into problems.
The four dimensions spoken of here are said to be the basic four parts of our nature. They are: spiritual, mental, physical and social/emotional.
Physical renewal involves things along the lines of nutrition and exercise. Renewing spiritually may involve activities like meditation plus the clarification of values and commitment. Renewing mentally may involve things along the lines of reading, writing, planning and visualizing. Social/emotional renewal would entail things like providing service to others, being a good friend, listening with empathy and maintaining intrinsic security.