Final habit is called sharpen the saw. Again, not a new topic, but a great one to revisit.
The title comes from a little story about a woodworker. He dismisses the suggestion to take a little time to get his gear in shape, because he has so many trees to get to. This habit is about preserving and enhancing yourself.
Secondly, taking the time to polish yourself on something can be a really good remedy when you feel a little burnt out or overwhelmed. Reading a really inspiring book or going for something active can be the well needed break which gives you new energy.
Covey talks about different dimensions (physical, social, mental and spiritual). Essentially: what are you doing to grow and improve on all these four dimensions? How are you investing in yourself?