The song is about the biblical apocalypse, this certain song is happening during either the war in heaven or the four horsemen releasing their power upon the earth.
[Verse]
Eia, ergo, advocata nostra, illos tuos
Misericordes oculos ad nos converte;
Et Iesum, benedictum fructum ventris tui
Knocking On Forbidden Doors was written by Michael Cretu.
Knocking On Forbidden Doors was produced by Michael Cretu.
Enigma released Knocking On Forbidden Doors on Mon Dec 10 1990.