The ventricles of the human brain... are filled with hormones, and until the hormones swimming in these oceans are dredged out, countless millions of our fellows will remain with brain illnesses that can be neither understood nor treated. Many of their hormone-hungry brains may be fixed as easily as hormone-hungry bodies are fixed with thyroid hormone, insulin, oestrogen and testosterone, but that work cannot begin until cause and effect relationships between brain hormones and brain diseases have been established.

The Fabric of Mind (1985)