An Unrefined Body Cannot Perceive Refined Physicality

R' Shmaryahu Gurary told a story in front of [the Rebbe Rashab] from R' Yisroel of Koznitz, that he said to his son "I no longer have a body". So his son grasped his [father's] hand and said "here is a hand." His father answered -- "you are touching with [an unrefined physical] body."

The Rebbe Rashab said (free translation): We understand [...] that the body is not a body before it becomes unified [with the spiritual].

Toras Sholom, p. 211