Running without Listening

I don't mean music - I mean that inner voice that says "My knee hurts", "My lungs hurt", "I have the wrong socks on" - all excuses to stop running. Last fall I stopped listening and kept running. I found that the knee pain disappeared, my lungs got more efficient and clothing doesn't hold me back. Now I listen to the voice that says "I can run faster and further!"

Bittersweet

It is good to be home but it is not good to be home. How can either of those be bitter or sweet?