The second of three programmes with Geoffrey Moorhouse talking to people about insights into reality glimpsed through drugs, madness, or mysticism. Are these experiences a genuine contact with God or merely delusion?

'In going through my madness to find myself, I found God-within myself.'
'I felt myself in contact with the source of life and being and creation.'
Mary Barnes and Morag Coate, who have both been mad, and two doctors who knew them in their illnesses.