Task: Question Answering
Input (English): Passage: Tacitus wrote in his Germania: Germania 9.6: Ceterum nec cohibere parietibus deos neque in ullam humani oris speciem adsimulare ex magnitudine caelestium arbitrator – "The Germans, however, do not consider it consistent with the grandeur of celestial beings to confine the gods within walls, or to liken them to the form of any human countenance." Germania 40: mox vehiculum et vestis et, si credere velis, numen ipsum secreto lacu abluitur – "Afterwards the car, the vestments, and, if you like to believe it, the divinity herself, are purified in a secret lake." Question: Where is the divinity herself purified? 
Output (English): a secret lake