The Mutakallemim... apply the term non-existence only to absolute non-existence, and not to absence of properties. A property and the absence of that property are considered by them as two opposites, they treat, e.g. , blindness and sight, death and life, in the same way as heat and cold. Therefore they say, without any qualification, non-existence does not require any agent, an agent is required when something is produced.
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