Joy I: Appreciating Exertion
The third aspect is joy or appreciation. Sitting practice is joyful, but not in the usual sense. It is hard joy, tough joy, but you will achieve something in the end. Joy is connected with hard work and exertion: you appreciate working hard and you are not trying to escape from pain. If you stay with the pain of practice, it is like carving a rock: It is not necessarily pleasurable, but you are achieving something. It is like sawing a tree or trying to swim across a river: you keep going and appreciate keeping going.
From “Following the Example of the Buddha” in The Profound Treasury of the Ocean of Dharma, Volume One, by Chögyam Trungpa, page 181