AC 9243-9244 - confidence

AC 9243
. . . he who does not believe the truths which are from God,
cannot believe in God;
because to believe in God
is to believe from the truths which are from God.

AC 9244
All who are in heavenly love,
have confidence that they will be saved by the Lord;
for they believe that the Lord came into the world
in order to give eternal life to those 
who believe and live 
according to the commandments which He taught;
and that He regenerates these,
and so makes them fit for heaven;
and that He does this Himself alone,
from pure mercy, 
without the aid of man.
This is meant by "believing in the Lord."