Two major things that have evolved my mindset recently:
1) Having a battle buddy/business partner/best friend relationship that helps me stay mentally young and hungry. Every challenge that comes up solidifies our bond and partnership and I am grateful and fortunate.
This relationship continuously improves my mindset and is a life-changer for me.
2) Latest read is Last Lecture by Randy Pausch. A story that helps focus my energy on what truly matters in this life - the ones you love and love you back. A powerful book about legacy and never giving up.