From Impermanence Is Buddha-Nature: Dōgen’s Understanding of Temporality, by Joan Stambaugh:
For Plato, the body is the prison of the soul; the senses are a hindrance to knowledge, able to convey knowledge of becoming and change, but never of pure being. Thus Plato could define philosophy as a preparation for dying and for death — the release of the soul from its prison. This view of the permanence of the soul appears to be ingrained in our [Western] religions and culture, if only as a wistful hope or even a fantastic dream.
… “Does the soul continue to exist after death?” was one of the metaphysical questions that the Buddha refused to answer. … For Dōgen, often the question is the answer.
The question whether the soul continues to exist after death or not presupposes that birth is the beginning of a continuous process, life, and death is its end. If we do not accept this view of life as a durational stretch of time, we must find a different way to question life and death. (p. 73)