Proof that if a possible essence exists, then this necessarily means that this essence acquired its existence from that which is other than itself.
Emergence of All Contingents
Proof for the emergence of any essence that is known to be contingent.
Emergent Essences Exist Contingently
Emergent essences exist contingently. In other words, whatever comes into existence, acquired its existence from an essence extrinsic to it.
Whatever Can Come to an End, Must have a Beginning
If an essence can cease to exist, then this essence must have emerged into existence. This is because the existence of this essence can be neither necessary, nor impossible. Which means its existence must be contingent. And all contingent essences are emergent.
The Impossibility of Tasalsul
Tasalsul is the belief that time is beginningless. Meaning: that the present is preceded by an infinite number of past events. It is impossible due to its being contradictory.
Keys to the Unseen 