Being a parent is an obvious answer - there is another life that is reliant on you to change them, feed them, clean them, and make them your top priority. Another example is when volunteering and sacrificing your time to help those less fortunate. Or even something so small as holding the door open for someone behind me. Most importantly, following Jesus and living life as he would and putting my fleshly thoughts and ways on the back burner.
How are some ways you are selfless?
"Truly great leaders in life become so because they cause others to be greater than themselves." - Steve Farber