An angel pure walks at night
And guides us through our dreams od sleep
As it did through our waking hours
And in safety us it does keep.

Never resting, our angel pure
God given and divine
Guards us from inspiration evil
Thank God each of us can say 'It is mine! '.

Tomás Ó Cárthaigh

http://www.poemhunter.com/poem/an-angel-pure-walks-at-night/