You ask, "What do you mean you have to find out if you are among the chosen?" I did not say that. I said that he need NOT find out if he is chosen in order to be among the chosen
But to avoid derailing the course of my question --as to what you were referring to by "saved" in post #81, where you say, "Hm, the meaning of particular redemption sounds unclear though. I could say I believe in unlimited atonement, yet a person is not redeemed until he is saved. Wouldn't that also be particular redemption?." You have answered by saying that you had been referring to the moment of regeneration. So I am left wondering what you are getting at with, "wouldn't that also be particular redemption?".
A person, any person, IF REDEEMED, is redeemed at the cross. The payment is made by Christ's death and when Christ died. That does not mean he is therefore not lost, but it does mean the payment was made at that point.
However, even if you are right and the redemption does not happen until regeneration, in the end it is no different concerning Particular Redemption --ONLY those God has chosen for his display of, and use of, mercy upon some, and his awful justice carried out upon their substitute, will receive that mercy, and the payment is ONLY for their debt.
No matter what theoretical or rhetorical or abstract constructions one may come up with, such as 'Provisional Atonement', are constructs to ease the human mind. In the end it makes no sense, (nor is it Biblical), to say that Christ actually paid for the sins of absolutely everyone who ever lived or will live, if some of them end up paying for the sin themselves.