Useful ideas in this video clip: 

• Pay attention. You have to be aware of your energy levels in order to maintain it properly.
• You can draw and build a lot of energy when you connect to your personal purpose.
• How does the old fable about the Six Stonecutters relate to companies like Apple?
• The meaning of whatever you are doing (for fun or living) is exactly the meaning you assign to it.
• Leadership is about creating a world to which people want to belong and to contribute.