וְלֹא־אֶחָ֣ד עָשָׂ֗ה וּשְׁאָ֥ר ר֙וּחַ֙ ל֔וֹ וּמָה֙ הָֽאֶחָ֔ד מְבַקֵּ֖שׁ זֶ֣רַע אֱלֹהִ֑ים וְנִשְׁמַרְתֶּם֙ בְּר֣וּחֲכֶ֔ם וּבְאֵ֥שֶׁת נְעוּרֶ֖יךָ אַל־יִבְגֹּֽד׃
여호와는 영이 유여하실지라도 오직 하나를 짓지 아니하셨느냐 어찌하여 하나만 지으셨느냐 이는 경건한 자손을 얻고자 하심이니라 그러므로 네 심령을 삼가 지켜 어려서 취한 아내에게 궤사를 행치 말지니라
Akeidat Yitzchak
The author concludes that nefesh, soul at birth—though superior as a life motivating force to all other living creatures, just as the human body is superior to all other living creatures—is something quite primitive. Through the life experience it develops into the kind of force that matures. "Free will" is part of the force that helps this "life force" mature and become the kind of disembodied spirit that survives the flesh at the time the body dies. "Nefesh-Ruach-Neshamah” are the way stations in the progress of this "life motivating force" of man towards the formation of the disembodied immortal personality. "Ruach hakodesh,” holy spirit, is not yet the level at which "nevu-ah," prophetic insights can be achieved. That stage is reached only by the "neshamah" stage in a person's development. If actual nevua-ah is denied such people, it is only because their contemporaries do not deserve to be the beneficiaries of such prophetic insights (Sukkah 21).