Your most important skill: Empathy
chadfowler.com/2014/01/19/empathy.html
From the page
Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.
Empathy is the most important skill you can practice. It will lead to greater success personally and professionally and will allow you to become happier the more you practice.