Surrounded by Divine Mercy on Good Friday

The origin of "Divine Mercy" comes from Good Friday the centurion who peirced Our Lord's side with a lance. And immediately blood and water gushed forth. An eye witness has testified to this fact so you will know that it is true. He knows he is telling the truth, and he testifies so that you may also believe.
"O blood and water 
which poured forth 
from the Heart of Jesus
as a fount of mercy for us,
I trust in Thee."