This word expresses a human attribute that is the most important one, in my opinion. (Although it needs to be accompanied by healthy self-esteem.) I think that if you have it, you probably have the best interests of humankind in your heart:
humility
hu·mil·i·ty
The quality or condition of being humble.
[early 14c., from O.Fr. humilité, from L. humilitatem (nom. humilitas) "lowness, insignificance," in Church L. "meekness," from humilis "humble."]
“Whoever undertakes to set himself up as a judge of Truth and Knowledge is shipwrecked by the laughter of the gods.”
~ Albert Einstein
