How can a sinner know His sins on earth forgiven?

208 Old 134th (St. Michael). S. M.

1 How can a sinner know
   His sins on earth forgiven?
   How can my gracious Savior show
   My name inscribed in heaven?

2 What we have felt and seen
   With confidence we tell;
   And publish to the sons of men
   The signs infallible.

3 We who in Christ believe
   That He for us hath died,
   We all His unknown peace receive,
   And feel His blood applied.

4 We by his Spirit prove
   and know the things of God,
   the things which freely of his love
   he hath on us bestowed.
                         Charles Wesley
                         The Methodist Hymnal 1939 edition

<idle musing>
Hymnary.org adds some verses:

4 Exults our rising soul,
   Disburdened of her load,
   And swells unutterably full
   Of glory and of God.

5 His love surpassing far
   The love of all beneath
   We find within our hearts, and dare
   The pointless darts of death.

6 Stronger than death or hell
   The sacred power we prove;
   And, conquerors of the world, we dwell
   In heaven, who dwell in love.

And the Methodist Hymnal from 1989 adds two different ones to the end:

5. The meek and lowly heart
   that in our Savior was,
   to us that Spirit doth impart
   and signs us with his cross.

6. Our nature's turned, our mind
   transformed in all its powers,
   and both the witnesses are joined,
   the Spirit of God with ours.

</idle musing>