Another request Paul makes in his prayer to God is for the Ephesians to have the eyes of their heart enlightened (Ephesians 1:18, 19). When this happens, then they will be able to perceive the “hope of [God’s] calling, what are the riches of the glory of His inheritance in the saints, and what is the surpassing greatness of His power toward us who believe.”
The phrase “eyes of your heart” is used to describe how one is enlightened. The heart, as used in this context, is the center of man’s emotions and his intellect. Speaking metaphorically, the heart has “eyes” allowing both the emotions and the intellect to “see” what God has done for the believer. Paul wants God to help his readers to have a better understanding of what God has provided.