There is no need to have a deep understanding of Zen.
We have to study with our warm heart, not just with our brain.
We do not exist for the sake of something else. We exist for the sake of ourselves.
Enlightenment is not a complete remedy.
Tai Shimano visited Shunryu Suzuki. "How are you feeling these days?" Suzuki replied, "They have a new name for me: Cancer!"
You will always exist in the universe in one form or another.