The mission of St. John Lutheran Church is to proclaim salvation through Christ Jesus, to nurture believers in their faith and to equip them for ministry in His kingdom, here in Wheaton and throughout the world, through the power of the Holy Spirit to the Glory of God the Father.

- Worship and praise
- Prayer (congregational and personal)
- Preaching (the beauty of the Law and Gospel)
- Teaching (all that Christ taught us / to all ages)
- Studying (all that Christ taught us / by all ages)
- Sharing God's Word and spirit of forgiveness
- Administering the Sacraments (Baptism, Lord's Supper)
- Witnessing (within the congregation and outside it)
- Supporting Christian Missions (local and worldwide)
- Loving, caring and supporting (members and non-members)
- Providing Pastoral care to church and community
- Maintaining a proper stewardship attitude (of money, time and talents, for local, Synodical and charitable work)
- Fostering fellowship activity (for worship education and fellowship)