Eternal life is one of those things that no devil can imitate. A devil can set himself in power, enforce rules and laws that affect billions of people, and force armies to do his every bidding; then all God has to do is raise up one person from the dead, and the whole world, in all of its faithlessness, trembles and shakes.
There is another thing that no devil can imitate, and that is fulfilling the words of a prophet. You see, Zerubabbel can speak plainly - outline a detail of the possible future, and Yahweh being the God of said prophet, can fulfill Zerubabbel's words, just because God wanted to. Zerubabbel's power is God's power - his Gospel is God's gospel. Zerubabbel only needs to raise up his flesh and speak his words, then wait for his business to become God's business in fullness, and watch God handle the rest.
