A request of some kind being thus the motive that lies behind the Babylonian prayers, it follows that the means taken to ascertain the will or intention of the gods with regard to that request formed an essential feature of the ritual. Indeed, to ascertain the will of a deity constituted one of the most important functions of the priest--perhaps _the_ most important function. The prayer was of no use unless it was answered, and the priest alone could tell whether the answer was afforded. The efforts of the priest were accordingly directed towards this end--the prognostication of the future. What was the intention of the deity? Would the hoped-for deliverance from evil be realized? Would the demon of disease leave the body? Would the symbolical acts, burning of effigies, loosening of knots, and the like, have the desired effect? Upon the success of the priest in performing this function of prognostication everything depended, both for himself and for the petitioner. The natural and indeed necessary complement to the priest as exorciser is the priest as the forecaster of the future. Since no one, not even the king, could approach a deity directly, the mediation of the priest was needed on every occasion of a religious import. The ordinary means at the disposal of the priest for ascertaining the divine will or caprice were twofold,--directly through oracles or indirectly by means of omens derived from an examination of the sacrifices offered. A complete Babylonian ritual therefore required, besides the appeal made by the petitioner through the priests or with their assistance, an incantation introduced in some form, an offering, certain symbolical acts and omens. The offerings and the symbolical acts, as a matter of fact, appear to have preceded[491] the prayer and the incantation, but in the prayers they are referred to again, and generally just before the interpretation of the omens. The omens constituted the ulterior end in view. Because of the looked-for omens the offering was brought, the symbolical acts performed, the incantations recited. All these rites formed the preparation for the grand _finale_. The worshipper waited anxiously for the decision of the priest. Attached, therefore, to the prayers we frequently find directions intended for the priests as to the signs to which his attention should be directed, certain peculiarities exhibited in parts of the animal sacrificed from which certain conclusions may be drawn. The observation of these signs grows to the dimensions of a science equal in extent to the observation of the heavenly bodies whose movements, as indeed the whole of the natural world, were supposed to exert an influence over the fate of mankind.