There can be consciousness without a brain. Hence, there can be consciousness after death. To verify this, it is necessary to isolate the principle of consciousness from its products. Such isolation can only be effected through some kind of mystical experience. This experience can be brought about by meditational practice. The materialists who refuse to try such practice or who, trying, fail, cannot be regarded as disposing of the question.
-- Notebooks Category 4: Elementary Meditation > Chapter 1: Preparatory > # 4