A “Godform” is an idea that comes supposedly from ancient Egypt, although it was first described by the NeoPlatonist Iamblichus slightly less that 2000 years ago. The basic idea was that when a priest attempted to speak and act and imagine themselves as a god of the Egyptian pantheon, this served to invoke that god. Iamblichus’ idea was that the repeated “Assuming of a Godform” gradually transmuted the priest so that when he did so he became more and more godlike in real-life.
The Golden Dawn took this idea and made it the rationale as to why its grade ceremonies work on a magical level, i.e. because all the officers are assuming godforms whilst they perform their roles. The GD goes further by turning the assumption of godforms into an actual magical technique which adepts learn both to better work the grade ceremonies, and to do their own meditation and compose and perform their own rituals.
The actual GD technique is an unpublished teaching, but a simplified version of it can be found in the Ciceros’ Self Initiation book.
Sol Ascendans - The Website of Alex Sumner 