Satan is God's tool to tempt and expose and harden reprobates and to tempt and reveal and temper the elect.
The regenerate elect's attitude towards Satan, regarding oneself, is one of wary indifference, as towards an enemy that has been conquered. The regenerate elect's attitude towards Satan, regarding good will towards one's neighbor, is one of confrontation and battle, as to defend the faith and glorify God.
An elect of God knows Satan is a necessity in God's plan of redemption, and hence does not rail emotionally at, or get depressed because of, the evil angel and his followers and their deeds; but he also knows Satan is dangerous to the degree of eternal death and darkness without the God-given shield of faith and sword of the Spirit -- and without wary watchfulness until the
return of the King.