The Early Sessions, Book 2

"The ego and the outer senses reinforce the belief in a closed system, and therefore close it. The inner senses, when the physical body is relaxed, will carry you through the imaginary boundaries, but a conscious focus upon the boundaries to be passed through will tend to reinforce them. Concentrate upon the goal rather than the means of attaining it, and you will attain it."

Session 78, Page 290