Buddha renounced every worldly happiness because he wanted to share with the whole world his happiness which was to be had by men who sacrificed and suffered in the search for truth.
I believe that the sum total of the energy of mankind is not to bring us down but to lift us up, and that is the result of the definite, if unconscious, working of the law of love. The fact that mankind persists shows that the cohesive force is greater than the disruptive force, centripetal force greater than centrifugal.