Why do we do what we do? why do we see what we see? Seeing, attachment, generosity, all experiences in life can arise only because of a concurrence of conditions. This book is an introduction to the seventh book of the Abhidhamma, that deals with the conditionality of life. It explains the deep underlying motives for all actions through body, speech and mind and shows that these are dependent on conditions and cannot be controlled by a 'self'. The study of conditions is indispensable for understanding the teaching of the 'Dependent Origination' and the meaning of the Buddha's teaching of non-self. This book is suitable for those who have already made a study of the Buddha's teachings.