Light of lights! All gloom dispelling,
Thou didst come to make thy dwelling
Here within our world of sight.
Lord, in pity and in power,
Thou didst in our darkest hour
Rend the clouds and show thy light.

Praise to thee in earth and heaven
Now and evermore be given,
Christ, who art our sun and shield.
Lord, for us thy life thou gavest,
Those who trust in thee thou savest,
All the mercy stands revealed.

--St. Thomas Aquinas