The aforesaid unity is proved hereby, that as the Father is said to be grieved and tempted, so too the Son. The Son was also tempted in the wilderness, where a figure of the cross was set up in the brazen serpent: but the Apostle says that the Spirit also was there tempted. St. Ambrose infers from this that the Israelites were guided into the promised land by the same Spirit, and that His will and power are one with those of the Father and the Son.