Its a positive promise that Jesus will shall save His People from their sins !
Matt 1:21
21 And she shall bring forth a son, and thou shalt call his name Jesus: for he shall save his people from their sins.
His people are all who belong to Him Gal 3:29
29 And if ye be Christ's, then are ye Abraham's seed, and heirs according to the promise.
And Christ Jesus came to save sinners, not make it possible 1 Tim 1:15,13
15 This is a faithful saying, and worthy of all acceptation, that Christ Jesus came into the world to save sinners; of whom I am chief.
To save sinners like He saved the Apostle Paul, in fact thats what hes writing of in the above scripture, how He was saved from blaspheming, and persecuting and unbelief and ignorance
13 Who was before a blasphemer, and a persecutor, and injurious: but I obtained mercy, because I did it ignorantly in unbelief.
And how Christ saved Zacchaeus Lk 19:2-10
2 And, behold, there was a man named Zacchaeus, which was the chief among the publicans, and he was rich.
3 And he sought to see Jesus who he was; and could not for the press, because he was little of stature.
4 And he ran before, and climbed up into a sycomore tree to see him: for he was to pass that way.
5 And when Jesus came to the place, he looked up, and saw him, and said unto him, Zacchaeus, make haste, and come down; for to day I must abide at thy house.
6 And he made haste, and came down, and received him joyfully.
7 And when they saw it, they all murmured, saying, That he was gone to be guest with a man that is a sinner.
8 And Zacchaeus stood, and said unto the Lord: Behold, Lord, the half of my goods I give to the poor; and if I have taken any thing from any man by false accusation, I restore him fourfold.
9 And Jesus said unto him, This day is salvation come to this house, forsomuch as he also is a son of Abraham.
10 For the Son of man is come to seek and to save that which was lost.
You see how Christ came to seek and to save Paul and Zacchaeus, thats how He saves in one fashion or another each of them He came to save from their sins.