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Perhaps the most inaccessible magical phenomenon in West Nordic history, namely seiδr

 
…..den kanske mest svårtillgångliga magiska företeelsen i västnordisk tid, nämligen sejden ….perhaps the most inaccessible magical phenomenon in West Nordic history, namely seiδr
Er þat ok margra heimskra manna náttúra, at þeir trúa því einu, er þeir sjá sínum augum eða heyra sínum eyrum, er þeim þykkir fjarlægt sinni náttúru, svá sem orðit hefir um vitra manna ráðagerðir eða mikit afl eða frábæran léttleika fyrirma nna, svá ok eigi síðr um konstir eða huklaraskap ok mikla fjölkynngi, þá þeir seiddu at sumum mönnum ævinliga ógæfu eða aldrtila, en sumum veraldar virðing, fjár ok metnaðar. Þeir æstu stundum höfuðskepnur, en stundum kyrrðu, svá sem var Óðinn eða aðrir þeir, er af honum námu galdrlistir eða lækningar.

There are plenty of people so foolish that they believe nothing but what they have seen with their own eyes or heard with their own ears - never anything unfamiliar to them, such as the councils of the wise, or the strength and amazing skills of the great heroes, or the way in which seiður [pronounced sayther] or skills of the mind, [huklaraskap] and powerful sorcery [fjolkyngi] may seiður death or a lifetime of misery for some, or bestow worldly honours, riches and rank on others. These [men] would sometimes stir up the elements, and sometimes calm them down, just like Othinn and all those who learnt from him these skills, of galður and healing.

Ref: Göngu-Hrólfs Saga Prologue