Solus Christus asserted that Jesus Christ is the sole mediator between God and humanity, excluding any mediating role for saints, Mary, or priestly hierarchy. The Reformers grounded this in 1 Timothy 2:5 ("one mediator between God and men, the man Christ Jesus") and directed it against the medieval cult of saints, Marian intercession, and the priestly sacrificial system of the Mass. This was not a denial of the Church's role in proclaiming Christ but a rejection of any other figure standing between the believer and direct access to God through Christ.
"There is but one God, and one mediator between God and man; namely, the man Jesus Christ, who gave himself a ransom for all. Therefore, let no man think to draw near unto God, or obtain grace of him, without this mediator, high-priest, and advocate" — Luther on 1 Timothy 2:5 as the ground of solus Christus: Christ alone is the access to God, excluding saints, Mary, and all other intercessors from any mediating role.
"Since he himself is the only way and the only access by which we can draw near to God, those who deviate from this way, and decline this access, have no other remaining; his throne presents nothing but wrath, judgment, and terror" — Calvin on Christ as the singular path to the Father, making any alternative mediator not merely unnecessary but spiritually perilous.
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