If you are talking about the stairs inside the Temple itself that are locked try this:
<span class='standouttext'>Spoiler : </span><span class='spoiler'> When you talked to the Bishop he should have told you to go talk to a prisoner. The Prisoner is in the small prison outside the temple and is marked on your map. The prisoner will tell you to locate an item to unlock the stairs. The item is located outside the North wall of the temple area in a pile of rocks. </span>
Hope that helps.
