Roman worship often took the form of sacrifices. Romans tried to please the gods by giving food or other gifts to the gods and to other deities, including the souls of dead people. With sacrifices like this, the Romans hoped to avoid bad luck and bring good luck, such as fertility and a successful harvest, or victory in war. The Romans built temples to house the images of their gods. These images were usually statues, and the Romans would offer sacrifices by burning food or frankincense. Precious objects would be given to the gods in rituals and stored in the temples. The Romans believed this pleased the gods. The Romans also did ritual purification, to avoid bad luck and to avoid offending the gods and spirits.