When you practice mindfulness as a way of life, over time you start to notice that your understanding of what it means will naturally deepen. You may find an increased capacity to respond more flexibly to the present moment both in your personal life and your clinical work. But even when you have intimately experienced and felt the depth of the practice, you may somehow still struggle to describe it or put it into words when necessary for client work.
Mindfulness in the context of psychotherapy is more than just a technique or a theoretical perspective; it is a way of being with and relating to experience. Regardless of whether or not you choose to incorporate formal mindfulness practices in your sessions with clients, having your own mindfulness practice will positively inform your work.