And there was a thick darkness in all the land of Egypt three days...they saw not one another (Ex. 10: 22,23)
The worst kind of darkness is when people refuse to "see" each other and are uninterested in knowing about their fellow man. Indeed, the world is darkened when every individual lives only for himself. (Eshkol Maamarim)
And the man Moses was very great in the land of Egypt, in the sight of Pharaoh's servants, and in the sight of the people (Ex. 11:3)
There are many different kinds of public figures: Some personalities are better appreciated by the upper classes, while others are more popular among the common folk. Everyone, however, recognized Moses' greatness, from the highest-ranking Egyptian ministers to the lowest level of society. (Rabbi Boruch Epstein)