If you are apart from this,
you have gone amiss.

Investigating Chan goes beyond the hard work we do while sitting in meditation. We have to work hard while walking, standing, sitting, or reclining. Sitting meditation provides the opportunity to concentration on the focal point of our meditation topic. Then, while walking, standing, sitting, and reclining, we continue to investigate “Who is mindful of the Buddha?” The entire verse reads,

Walking, standing, sitting, and lying down,
do not be apart from this.
If you are apart from this,
you have gone amiss.

What is this? It refers to our investigation of our meditation
topic, “Who is mindful of the Buddha?”