selflessness       
noun [ U ]  approving uk/ˈself.ləs.nəs/ us/ˈself.ləs.nəs/
 无私
the quality of caring more about what other people need and want than about what you yourself need and want
  I am touched by the bravery and selflessness of our emergency services personnel. 我被紧急服务人员的勇敢和无私精神所感动。 
 In addition to her remarkable selflessness, she has also inspired others to get involved.  除了她非凡的无私奉献精神外,她还激励其他人参与其中。 
 See: selfless
 - More examples
 - His courage and selflessness gave us the strength to cope.
 - She had such dignity and selflessness.
 - He was a man with the heart of a lion and a soul filled with compassion and selflessness.