The second proof of the נשמה’s lofty origin is from the מאמר חז”ל: ישראל עלו במחשבה.
This is a Kabbalistic “Proof” linking Neshamos to Chochma and through Chochma to the very Essence of G-dliness.
The use of Kabbalah within Chassidus gives it “form” and a framework for understanding it intellectually.