August 6/19 is the feast of the Transfiguration. Below are links to two articles about the Transfiguration icon. The articles also contain links to sermons and other resources related to the feast.
You were transfigured on the Mount, Christ God revealing Your glory to Your disciples, insofar as they could comprehend.
Illuminate us sinners also with Your everlasting light, through the intercessions of the Theotokos.
O Giver of light, glory to You.