I've had this prayer card in my wallet for so long I can't remember acquiring it. It's been with me for about 20 years now, which is rather incredible. The thing that surprises me about it is every so often I'll pull it out and the person with me will say, "Oh, I carry that card too!" It's always a person who is in no way religious but feels better having this card.
Although in truth the concept of a Guardian Angel has nothing to do with religion. It's something we're all born with and can call on at anytime. If you are ever feeling alone or in doubt pull up this image, read the prayer, and know that it was heard.