Take God at His Word.

1 John 2:12
It is evident, therefore, that if you TAKE GOD AT HIS WORD, your sins, however many, “Are FORGIVEN.”―See 1 John 2:1212I write unto you, little children, because your sins are forgiven you for his name's sake. (1 John 2:12).
CHRIST JESUS, as Son of man, having “once” settled, with His own life’s blood, the question of sin, the reader is entreated to see whether he has settled the question of his own soul’s salvation by “only” (Mark 5:3636As soon as Jesus heard the word that was spoken, he saith unto the ruler of the synagogue, Be not afraid, only believe. (Mark 5:36)) believing the record that God has given of His Son (see 1 John 5:1111And this is the record, that God hath given to us eternal life, and this life is in his Son. (1 John 5:11)),1 and then letting his life, words, and habits show to all that Christ is in his heart, not only “the” (Colossians 1:2727To whom God would make known what is the riches of the glory of this mystery among the Gentiles; which is Christ in you, the hope of glory: (Colossians 1:27)) hope of glory, but the certainty of acceptance with God.
 
1. “And this is the record, that God hath given to us eternal life, and this life is in His Son.”