By the time writing was invented, the Greeks and Egyptians had already learned to extract opium from poppies to facilitate sleep.

Many tribal peoples consider illness to be one of the most reliable sources of revelation. Many of the practices that traditional religions impose upon seekers-abstinence, isolation, stillness-are practices that illness imposes upon us, so it is in a sense a cocoon that allows revelation to unfold.

My body has taught me many things, all of them filled with soul: how to dance and make love, mourn and make music; now it is teaching me how to heal. I am learning to heed the shifting currents of my body-the subtle changes in temperature, muscle tension, thought and mood-the way a sailor rides the wind by reading the ripples on the water.

I often felt better as soon as I swallowed my vitamin C, long before it had time to take effect. Medical researchers call it 'placebo effect'; I prefer to call it magic, for it occurs when something - a pill or a word - is imbued with power and meaning, and so it becomes effective. That is alchemy.

By the time writing was invented, the Greeks and Egyptians had already learned to extract opium from poppies to facilitate sleep.