To make complete atonement for all previous sins in only one incarnation.
It's said that you'll come back to Heaven faster if you do so instead of in many incarnations. This term is used to refer to a person who suffers too much.
Thánh Ngôn Hiệp Tuyển:
Ơn Trời cho mở Ðạo kỳ ba,
Dìu dẫn nhơn sanh lánh vạy tà.
Ví muốn tu thân nhồi quả trước,
Gắng công sau sẽ đến cùng Ta.
The Collection of Divine Messages:
Thank goodness the Third Salvation begins
Teaching people how to stay away from sins.
Why not first make complete atonement?
Then come to Me later for practicing religion.