Press Enter and type "csmilton". Then, enter one of the following codes at the console window:
God mode: csyhwh
All guns: csguns
All essential items: csitems
Armor set to 200: csshroud
Health set to 200: cshealth
All angelic powers: csrosary
Ammunition: csammo
Essence set to 200: csessence
Stop time: cshalt