Inflib,
I see what you mean when you say that’Nature’ brought us here for a purpose, and ‘Nature has brought each of us for a very special reason’.
But for that to come about Nature or Existence instills in us, in our parents in this specific case, the very powerful, the irresistible urge for sex. If it were not so, the cosmic process in the human and animal realms would not operate. But since it does, THEN ( and this is the REASON, or one of the reasons)the parents can fulfill the duty of paying the debts due to those children, plus a host of other dues to other beings in a human body at that time.
I am therefore not with Tobias here when he says “A „purpose“ requires a creator or thinker to set the goal or purpose” The ultimate purpose of all beings anywhere in Existence, the purpose of Existence itself, is to attain Nibbana. Still there is no creator, no thinker, much less an ‘Almighty God’ behind all this. The ‘purpose’ is ingrained in the Dhamma itself, which took no almighty Thinker to sit down and formulate it – which, among other things, would beg the question: and what of the infinite time prior to that? DHAMMA ALWAYS IS. My way of putting it is: it MUST be so because it cannot be otherwise.(I apply this criterion to resolve conclusively any issue) If there were a beginning a multitude of irresolvable philosophical problems come up.
In the post ‘Patisandhi Citta – How the Next Life is Determined According to Gathi’ Lal and myself take up precisely this topic, from my entry dated September 15, 2018 at 7:52 pm (last para) et seq. See what you make of it.
Much Metta