ACIM Quote from Chapter 1, Section 3 - Revelation, Time and Miracles.

Revelations are indirectly inspired by me because I am close to the Holy Spirit, and alert to the revelation-readiness of my brothers. I can thus bring down to them more than they can draw down to themselves. The Holy Spirit mediates higher to lower communication, keeping the direct channel from God to you open for revelation. Revelation is not reciprocal. It proceeds from God to you, but not from you to God.