The other day my friend and I were chatting online and she received an email. The email was on saying Tehillim on Purim for shidduchim, because Purim is such a holy day. One of the concepts was to help fight the shidduch crisis through prayer. The concept, was to assign everyone a parruk of tehillim for each name they submit, and in this way, the entire sefer tehillim will be said (hopefully) several times throughout Purim for those in need of a shidduch.
My friend told me about this email, sent it to me, and suggested that we submit each other's names, instead of our own. The idea behind this was that if you daven for someone else who is in the same situation you are in (in this case single, or "in shidduchim) you are more likely to get a positive response from Hashem.
I'm sure I've heard of that before and just didn't really think about it, but I'm wondering on whether or not it really holds any truth to it. Does it really matter who I'm davening for if its obvious I want the shidduch for myself? I don't mean this selfishly, I happen to love this friend dearly, and I would love to see her get married (hopefully after more than just 3 dates), but I'm really curious as to this "daven for each other" business.
If I'm on a mission to daven for my friend everyday so that she finds a shidduch, and she simultaneously davens for me everyday, is it really because we're davening for each other that is supposedly "working" or is it that we're actually davening (saying tehillim) everyday. I mean, I know myself, if I were to set out and say tehillim every single day for myself, I would probably lazy out, and be like "oh, so-and-so just told me about her really cute neighbor, and I'm tired, why not skip a day?" but if I were davening for my friend, I'd feel guilty skipping a day, and be MORE likely to stick to the "everyday" thing. Infact, I have such a guilty conscience, that unless something literally prevents me from saying the tehillim I would make sure to say it.
So, my question is, is there some sort of Torah, Chazel, Rashi .. behind this "davening for each other works better" or is it just because you're actually finally davening, and strongly commited out of guilt?