This isn't quite a memory as it is a gift. A gift for your afterlife. Namgyalma Mantra
Short mantra: OM DHRUM SOHA OM AMRITA AYUR DADE SOHA
Namgyalma is a deity for long life and purification. Her mantra has infinite benefits. It is said to be so powerful that anybody who hears it will never again be born from the womb. Therefore, if animals hear it, they will never again be reborn in the lower realms.
If you put this mantra in a stupa or on a banner inside your house or above the roof, whoever is touched by even the shadow of that stupa or banner will not be reborn in the lower realms. Also, any being touched by a breeze that has first touched a stupa, banner or statue containing this mantra is purified of the karma to be reborn in the lower realms. What need is there to mention, therefore, how great the purification experienced by those who recite this mantra or keep it on their body.
Namaste