"the lights upon you" represents the spotlight which means fame or popularity.
"lights within you" represents your kindness.
So that means, fame and popularity are useless if your attitude is horrible because "greatness is revealed on how kind you are
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You are great if your attitude is good.
the lights upon you represents popularity and attention given to you by many people
light within you is your heart, your kindness

It means that greatness in you is not revealed by popularity or attention but by being who you are.