Specifically in regard to the Gospel, you cannot just patch it on to what you already know about the Old Testament; it is not just a rephrasing of what is in the Old Testament, but a "mystery" that was only hinted at until Christ came.
Kibayana kuhusu injili, huwezi kuipachika kwenye kitu ulichokuwa unakifahamu kuhusu Agano la Kale; si jambo la kubadilisha misemo iliyomo kwenye Agano la Kale, lakini ni "fumbo" ambalo halikuelezewa mpaka wakati Kristo alipokuja.