Dark shadows exist at the back of the mind. Zazen can bring them to awareness that can act like a candle or a bright torch shining light into them and creating greater clarity. In zazen I don't try to stop myself thinking about the discomfort of such shadows, as there is something they are teaching. Writing about it with mindfulness and focus is a great support. This is what I feel is unraveling the wiles of karma and is a valuable process to do through communication, thus making issues clearer to awareness.
No! Not clearer to the mind, as rational reason likes to "own" each and every experience, wrapping them up and putting it away in a neat boxes for future reference. Spiritual experiences cannot be owned, because every experience is immediately gone and we are into the next one. It's the journey.