21 We have today heard those on whom hands were laid say, that no one can be saved unless he believe in the Father, the Son, and the Holy Spirit; that he is dead and buried who denies the Holy Spirit, and believes not the almighty power of the Trinity. The devil confesses this, but the Arians refuse to do so. The devil says: Let him who denies the Godhead of the Holy Spirit be so tormented as himself was tormented by the martyrs.
Source: Letters (New Advent)