If you do not change direction, you may end up where you are heading. — LAO TZU - Sahil Bloom

Leverage Parkinson's law and work toward a batched schedule: Create discrete blocks of time each day when you will handle major Management Time activities. Have one to three email-processing blocks per day. Have one to three call and meeting blocks per day. The goal here is to avoid a schedule where the red bleeds out across every single day.

The single greatest challenge for any ambitious person is eliminating the guilt associated with free time and rest.

As Mahatma Gandhi famously said, "Live as if you were to die tomorrow. Learn as if you were to live forever."