A “signature” was placed on all things by God to indicate their affinities — but it was hidden, hence the search for arcane knowledge. Knowing was guessing and interpreting, not observing or demonstrating.
Something that is arcane is secret or mysterious. Until a few months ago few people outside the arcane world of contemporary music had heard of Gorecki. secret and known or understood by only a few people (arcanus , from arca; ARK)
sır dolu
الواصلة
sır do·lu
النطق
علم أصول الكلمات
[ 's&r ] (noun.) 13th century. Middle English, from sire.