This early 1930s text is the first known which can be described as being directly RastafarI. However, the continuing line of texts leading up to this one is very long. Nevertheless, such a "foundation paper" of a eligion has to be rated with full stars. Non-RastafarI may not know what to do with it and/or even misinterpret it and give a different rating accordingly.
Only 19 text pages long, this book includes (additional) 15 pictures and additional 29 introduction text pages. The latter includes a well-selected passage of H.I.M. Haile Selassie-I; a prayer; information on Marcus Garvey and Leonard Percial Howell. A lot of references to other early Rasta and pre-Rasta texts; early responses to The Promised Key; some rudimentary information on RastafarI and the context in which this text had been written.
The Promised Key itself covers the coronation of Haile Selassie-I, "King of Kings"; biting remarks towards the then contemporary Vatican; Empress Menen; Ethiopia's Kingdom; spiritual notes on e.g. healing, fasting, way of government and some behavioral advice.
Note to non-RastafarI: The remarks towards the pope have to be seen in the context of the times. Colonialism was still in full swing, slavery still remembered. The historical Vatican had participated in and in a way even initiated both. The contemporary popes were Pius XI and Pius XII, who fell short of expected reactions towards fascism, in fact even blessing the bombs Mussolini dropped on Ethiopians during the occupation. One of their successors, Pope John Paul II, apologised for them. In this light, The Promised Key emancipated from white supremacy thinking and religious downpression (oppression). RastafarI is completely, radically pacifist and uses the tongue as the sword instead, not really getting concerned with political correctnes (which didn't exist in the 1930s anyway).
Howell aka G.G. Maragh made rejecting statements towards a mixing of black and white. This will have to be seen not literally, but metaphorically: In this context white representing the belief system of separation, black representing the knowledge of unity.
Note to RastafarI: The Promised Key makes rejecting remarks towards Moses, Abraham and descendants as being white. This was in the context of countering the white divisionist interpretation of the Western Bible version and back then lived Western Christianity of white supremacy. By doing that, Howell favoured a focus on Ethiopia and Haile Selassie-I instead. More recent knowledge suggests that Moses, Abraham and his descendents were indeed black skinned, connected to the ancient black Egyptians in way of belonging to the larger "ethnic" group of the Akan, back then populating vast areas in North Africa and southern Asia. (With the descendents of Abraham turning much lighter in skin color by prolonged Diasporan mixing processes.) With that in mind (and other knowledge not mentioned here) the respective passage in The Promised Key may today be interpreted accordingly in a not quite that literal way.