Excerpt from Guide of the Man of Good Will in the Exercise of Mental Prayer
A plenary indulgence, once a month, on the ordi nary conditions, may be gained by all the faithful who daily make a half, or at least a quarter of an hour of meditation.
I got the Kindle version and it had some typos (eg I is written as 1) but it doesn’t take away the fact that this is an excellent Guide. I will definitely re-read and revisit as I journey through mental prayer.