In working with physical ailments or problems on the physical level, you can develop cheerfulness and joy, in spite of your sickness. You need joy, because dealing with sickness is difficult. But even if you are sick, you do not have to feel that you are completely trapped. There are gaps, moments in which you can cheer yourself up and celebrate the existence of life.
~ From “Maintaining the Samaya Vow” in "The Tantric Path of Indestructible Wakefulness, Volume Three of The Profound Treasury of the Ocean of Dharma" by Chögyam Trungpa