Self and Meditation in Indian Buddhism by Johannes Bronkhorst
“In order to understand the ideas on the self and on meditation in early Buddhism and in some other contemporary Indian religions, one has to take into consideration the doctrine of karma as it existed at that time. This doctrine is older than Buddhism, and constitutes the background for other religious movements of ancient India besides Buddhism. There are few records describing the doctrine of karma in its earliest form, but the evidence we have supports the following presentation.”