The readings for the Third Sunday of Lent focus on what the heart sees but the eyes don't.
In the Book of Exodus, God communicates His covenant to His people in order to form them into a community of love. To do this, they will need a common set of teachings and beliefs, hence the Ten Commandments.
This set of beliefs, if lived, will bind them to their God but also establish Godly principles in their heart, and these principles will unite them into a community.
