Let things swallow you
When you observe and accept something, like pain, after a certain time, release totally any resistance.
Move from acceptance to surrender.
It means - let now the thing you observe and accept to swallow you, let it conquer every piece of your body, let it take control over you completely. Cease completely any control that may have remained over the process.
Doing so raises a lot of fear, a fear that this thing may drive you insane, may kill you, may cause you irrevocable damage.
This is the point where trust and faith enters the picture. The process of surrender is not just yet another secular psychological process. It involves parapsychological aspects and supernatural forces. You feel it very well when you do the process correctly. When you have the trust and faith in that supernatural which you cannot understand, fear drops, you drop and surrender is accomplished.