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

Revelation is intensely personal and cannot be meaningfully translated. That is why any attempt to describe it in words is impossible. Revelation induces only experience. Miracles, on the other hand, induce action. They are more useful now because of their interpersonal nature. In this phase of learning, working miracles is important because freedom from fear cannot be thrust upon you. Revelation is literally unspeakable because it is an experience of unspeakable love.