Baha'i World Faith Sect 2 by -'Abdu'l-Bahá- 1 Para

The logical proof of the immortality of the spirit is this, that no sign can come from a non-existing thing; that is to say, it is impossible that from absolute non-existence 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 non-existing sun no light can radiate, from a non-existing sea no waves appear, from a non-existing cloud no rain falls; a non-existing tree yields no fruit; a non-existing 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. (325:1)

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