Topic summary
Ruh

Extracted from the Wikipedia article Rūḥ.
As soul
In subsequent centuries, as the notion of soul started gaining ground in extra-quranic circles, it gradually started shaping the understanding of the quranic word ruh. Strangely, to corroborate the view that ruh in the Quran means soul, the verse that has been adduced the most is Q Isra’ 17:85 ("They ask you about ruh..."), the very verse that seems to say that ruh is unknowable to humans. Through the distorted prism of equating a non-quranic notion with a quranic word, ruh gradually ceased to be the elusive being known only to God, and even became the divine spark that eventually set humans apart from other animals. It should of course be noted that the process described here is gradual and long. This precludes the possibility of pinpointing any exact transitional points, or even identifying a straight linear direction. Nonetheless, a trend is discernible, along with an important factor that determined its direction: anthropocentric feelings.