And (the Almighty) took Abraham outside and said to him, “Look up, please at the heavens and count the stars, if you are able to count them!” And He said to him, “So too, will be your descendants!” (Genesis 15:5)
Rabbi Yisrael ben Eliezer, The Baal Shem Tov, the founder of the Hassidic movement, explained that the descendants of Abraham are like the stars. Though we see the stars from a great distance and they appear as tiny specks, in reality they are gigantic. So too, in this world many people may appear to be small and unimportant, but in reality they possess greatness.