It will become an immediate certainty to the meditator that mind is nothing beyond its cognizing function. Nowhere, behind or within the function, can any individual agent or abiding entity be detected. By way of one's own direct experience, one will this have arrived at the great truth of No-soul or Impersonality (anatta; Sanskrit anatma), showing that all existence is void of an abiding personality (self, soul, over-self, etc.) or an abiding substance of any description.

p. 38 - The Heart of Buddhist Meditation (1965)