Part 2: Everything that exists in man has some corresponding aspect in the lights... This is the mystery of “And from my flesh I perceive God” (Job 19:26). For this is the way to investigate and discover what exists in the Sefirot – through the creations in the lower world, just as what exists in the lower creations can be known through the Sefirot. Indeed, what falls under our scrutiny initially is that which exists in the lower creations. It is necessary to rise up to the source, to understand things properly in the light of the link that joins the lower world with the upper world, namely the link between the resultant effect and its cause....that make up the Partzufim above. i.e. it is in the Partzufim that we find this differentiation into particulars and not in the Sefirot.
Everything in Us Exists in the Heavenly Realm
Kalach Pitchei Chokhmah 71:7