Possibly a contentious unbeliever will maintain that we worshiping images in our churches are convicted of praying to lifeless idols. Far be it from us to do this. Faith makes Christians, and God, who cannot deceive, works miracles. We do not rest contented with mere colouring. With the material picture before our eyes we see the invisible God through the visible representation, and glorify Him as if present, not as a God without reality, but as a God who is the essence of being. Nor are the saints whom we glorify fictitious. They are in being, and are living with God; and their spirits being holy, the help, by the power of God, those who deserve and need their assistance.
St. John of Damascus
Treatise on Images