At the Altar of the Goddess you may donate items. If you donate enough items then you are rewarded with positive morality points. This is important if you have earned a red name and/or wrath by PK-ing another player. It may also be useful to maintain a positive morality point balance: The best items to donate are those useless excess items you pick up from mob drops - Counterpoison Scrolls, Return Scrolls, etc. An alternative is to purchase items in Auction House that are at their lowest possible value and donate them: they'll count 4 times the price you paid.