There is One Mind - How to learn it? Practical viewpoints for healing and awakening.

Two lessons in A Course in Miracles that supports this talk:

Lesson 130: It is Impossible to see Two Worlds
And this one includes a nice exercise about letting everything come up: "Begin your searching for the other world by asking for a strength beyond
your own, and recognizing what it is you seek. You do not want illusions. And you come
to these five minutes emptying your hands of all the petty treasures of this world. You
wait for God to help you, as you say:

It is impossible to see two worlds. Let me accept the strength God offers me and see no value in this world, that I may find my freedom and deliverance."

And "God will be there. For you have called upon the great unfailing power which will take this giant step with you in gratitude. "

Lesson 132: I Loose the World from All I thought it Was

The recording ended abruptly but we caught it on camera as well so the ending will be available on Youtube shortly: https://www.youtube.com/channel/UCNleEE7uRCDeSkEw61UZCIA