Strange but
http://dictionary.reference.com/search?q=delphi doesn't have adelphi, only delphi.
I may be wrong, but I am REALLY quite sure it is adelphi and not delphi.
Delphi is the font of all knowledge. More or less.
So, we are looking for those with a thirst to come visit.
Who are thirsty? People working in deserts - nomads, French Foreign Legion if you believe all the Beau Gest films. Drunks (I've never met a drunk who wasn't thirsty).
I'm sure there is a joke in here somewhere. If you find it, put it on a postcard and send it to your bank manager. And then send him a bill for sending you a postcard. B@stards.