Mark 3:28 is a precious truth tucked away in a passage that often sees other verses get the focus. And in many ways, rightfully so. I am a firm believer in context as a determinant for meaning as well as authorial intent. However, part of Jesus' warning to these Scribes was that "all sins will be forgiven the children of man"...not that every sin ever committed will be paid for by Christ and in a universal sense, all will go to heaven, but rather, than once Christ's work was finished, the sins...every sin, no matter how heinous, of the elect will be atoned for...God's glory and justice and love vindicated, and His mercy displayed. What a truth..."my sin, not in part, but the whole...is nailed to the cross and I bear it no more, praise the Lord, praise the Lord oh my soul"- so the hymn lyric says.
Praise the Lord, oh my soul!