we have great difficult to define 怎麼算“一旦得救”,
we can only rely on His PROMISE 信而受洗的 Bi4 Ran2 得救, nothing else.

Rom 8:30
預先所定下的人
又
召 他們來。
所召來的人， 又
稱 他們為義。所稱為義的人，
又
叫 他們
得 榮耀。

all because of GOD 召 稱 叫

who 到底是被揀選的呢？ all those 信而受洗的!
who 不是被揀選的呢？ all those not 信而受洗的!
我說我不確定神是不是揀選了你 means 我不確定 你 信 or not,we can see other's heart,
we can see our own heart, so 我 should 確定神是不是揀選了我,
if 我不確定神是不是揀選了我 means 我 need to be humble to learn
those sound doctrines.

GOD do everything 召... 稱... 叫得...
we got everything 信... 義... 榮耀...

right now, we, Lao2 Ku3 Tan4 Xi1,
信(bu4liao, bu4quan2, bu4jiu3)...
義(a little bit better than before but far from 義)...
榮耀 (reserved in heaven, but not ready to get it because of the compatability,
we can only be getting better and better but never could be possible to be there 義
till God completely give us Jesus' 義 required at the final judgment)...

I don't try to figure out everything by myself with my limited knowledge and experience, instead, I simply embrace those sound doctrines established
during the past 2,000 years