For the good of humanity, by far the most important quality of a person is his or her character.
Take the comparison between intelligence and integrity. A brilliant, evil person can do incredible harm. But an uneducated, good person will still likely have a net positive effect (bringing happiness to others, improving the bonds of our social contract and the soul of society, etc).
Thus, brilliance can actually be detrimental to society when not paired with virtue. But, integrity, even when not paired with brilliance, can only be beneficial.
Yet, when combined, brilliance and character have incredible potential to do a vast amount of good for the world.