portals to spiritual unity

From "The Power of Now" (p.111):

"Surrender - the letting go of mental emotional resistance to what is - also becomes a portal into the Unmanifested. The reason for this is simple: inner resistance cuts you off from the other people, from yourself, from the world around you. It strengthens feelings of separatedness, the more you are bound to the manifested, to the world of separate forms. The more you are bound to the world of form, the harder and more impenetrable you form identity becomes. The portal is closed, and you are cut off from the inner dimension, the dimension of depth. In the state of surrender, your form identity softens and becomes somewhat 'transparent,' as it were, so the Unmanifested can shine through."