I remember a few years ago on All Souls’ Day, after satisfying the conditions for a plenary indulgence, then going to the main cemetery in our city and offering it to a soul most in need - at the same time humbly ‘nudging’ God in His Divine mercy to work a spiritual ‘multiplyer’ for yet more souls.
On coming back home I walked through the darkened kitchen heading for the light switch in the hallway. As I traversed the kitchen the phone in one corner of the room [resting in it’s charging cradle] started to rock and emit those distinctive ‘contact sounds’ for two or three seconds - at the same time I got a strong ‘feeling’ in my mind that a soul or souls were saying their thankyou as they passed to Heaven - it was a very warming feeling indeed! I have had other similar experiences, and ‘know’ that those souls are so grateful for all prayers AND indulgences offered for them. Just imagine if you can how much more powerfully they can and do pray for you, especially when attianing Heaven!!!