Because of his position of leadership, Moses is judged extremely harshly when he sins.
Miriam and Aaron's criticism of Moses, and Miriam's punishment of leprosy teach lessons of sibling and communal responsibility.
The deaths of Nadav and Avihu, Aaron's sons, teach us the value and also danger of spontaneous religious expression.
The mirrors used to create the basin in the Tabernacle teach us that sanctified sexuality means seeing ourselves in relation to others.
Thought and internal spirituality still require physical action in order to deepen one's religious experience.