This is one of my favorite quotes of all time, from the mathematician and philosopher, Bertrand Russell, not only is it beautiful, true and poignant, but it is something we should all hope to strive for.

Three passions, simple but overwhelmingly strong, have governed my life: the longing for love, the search for knowledge, and unbearable pity for the suffering of mankind…. This has been my life. I have found it worth living, and would gladly live it again if the chance were offered me.”
— Bertrand Russell, “What I Have Lived For,” the prologue to his Autobiography, vol. I p. 4