The Gospel as “Outside”

Good news (or Gospel)–Isaiah 52:6-7–is always from “the outside.” It is extra nos.  By definition, any announcement of good news must come from outside ourselves.   This is radically at odds with any soteriology that views salvation as hinging on an interior-principle.  If my problem with reality is ontological, then what is the point of a good news announcement?  In that case, I don’t need anything from the outside.   I need an interior renovation to help me overcome the perpetual slide into non-being.