Some Ans. Questions 1908 by -'Abdu'l-Bahá- 1 Para

The logical proof of the immortality of the spirit is this, that no sign can come from a nonexisting thing-- that is to say, it is impossible that from absolute nonexistence signs should appear-- for the signs are the consequence of an existence, and the consequence depends upon the existence of the principle. So from a nonexisting sun no light can radiate; from a nonexisting sea no waves appear; from a nonexisting cloud no rain falls; a nonexisting tree yields no fruit; a nonexisting man neither manifests nor produces anything. Therefore, as long as signs of existence appear, they are a proof that the possessor of the sign is existent (225:1)

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