When dwelling feelings in feelings, practice by seeing all physical contact as painful. Dwelling in feelings; do not lean on (make contact) with the mind-made sensations of the physical body; dwell purely in feelings:

And how should the nutriment contact be seen? Suppose a cow with a skin disease would stand leaning against a wall. The creatures living in the wall would bite her. If she stood leaning against a tree, the creatures living in the tree would bite her. If she stood leaning against water, the creatures living in the water would bite her. If she stood leaning against open air, the creatures living in the air would bite her. Wherever that cow with a skin disease stands leaning, the creatures living there would bite her.

In the same way I say that the nutriment contact should be seen. When the nutriment contact is fully understood, the three feelings are fully understood. When the three feelings are fully understood, I say there is nothing further for a noble disciple to do. - SN12.63