One of the Advent 'O' Antiphons.
O Oriens - The Dawn Breaking, the Light of the World
Latin:
O Oriens, 
splendor lucis aeternae, et sol justitiae:
veni, et illumina sedentes in tenebris, et umbra mortis.
English:
O Morning Star,
splendour of light eternal and sun of righteousness:
Come and enlighten those who dwell in darkness and the shadow of death.
(Note: A literal translation of the Latin yields "O Rising Sun", but the poetic "O Morning Star" or "O Dayspring" is often preferred.) [Wikipedia.]
The sun rises in the East and floods the world with light. We look to the East for the Sun of Righteousness.

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