This is not a prayer, but an encouragement.
Here is the encouragement and a comment upon it:
“At the very moment when everything seems to go from bad to worse, it is then that we must make a supreme act of faith and know that the Grace will never fail us.”
The hours before the dawn are always the darkest.
The servitude just before freedom comes is the most painful of all.
But in the heart endowed with faith burns the eternal flame of hope which leaves no room for discouragement.
Ref : Words of The Mother Vol. III