Let your light so shine before men, that they may see your good works, and glorify your Father which is in heaven.
Jesus tells us to let our light shine in a manner before people that they will notice. We are to perform good works which I interpret as works of kindness to others. Our kindnesses should be polite, considerate, generous, loving and done publicly so that people will take notice. But when they notice us, we ought to remind them that we are no better than they are; that our ability to behave in a kind manner — even when we are treated unkindly — is strictly due to the Light within us. That Light is Jesus.
If we shine properly, those who notice us will eventually realize we are not normal human beings, that something is different about us. And they will realize the difference in us is the Holy Spirit and they will glorify God.