Try this in any posture you like: just allow thoughts to arise – thoughts of the past, thoughts of the future – and see how far you can simply observe these thoughts, just thoughts arising and passing away, as if these thoughts do not belong to you, as though you were observing another person’s thoughts.
If you are getting involved with the thoughts, if you are judging the thoughts, just know what is happening, and note the difference between being an observer and being involved with the thoughts.
Making friends with your thoughts, creating space for your thoughts by allowing any thought to arise, and observing how you react to the thoughts. The reaction doesn’t matter as long as you are aware of it, as long as you observe the reaction. Just being completely choiceless.
Now can you do the same in regard to any emotion that is arising in you. Whatever emotion is arising – sadness, anxiety, fear, joy – do not want it to stay in your mind, and also do not want it to go away, just be at one with that emotion, whatever it is. And do the same in regard to any sensation that is arising, pleasant sensations, unpleasant sensations, whatever it is, just let it be.
Being choiceless about thoughts, emotions, sensations – learn to be a witness to whatever is happening in your mind and body. Learning to see things as they are, and not as they should or must be.