A host of celebrated philosophers like Avicenna, Farabi, Taftazani and
Jurjani had recourse to this argument in proving God’s existence.
They asserted that all the possible creatures upon the earth could not
exist by themselves as they owed their existence to a Creator. “The
created” requires a Creator while God, “the Self-Existent” (whose
existence is a necessity) does not need a creator. The created is a product
of causality; their existence or non-existence are within the confines
of possibility. To think of the non-existence of the existent poses
no contradiction. However, this does not hold true for the Self-
Existing, God; otherwise the contradiction would be evident.
Philosophers like Leibniz argued in like manner the principle of
“Sufficient Reason.” According to him, the universe is made of possible
beings. The universe itself is a possibility. If we try to trace back
the chain of causality (which is impossible) until the infinite this
would not explain the universe. Yes, the universe is a possibility but
requires a Sufficient Reason outside its confines.