John Wesley On Original Sin

A denial of original sin contradicts the main design of the gospel, which is to humble vain man, and to ascribe to God’s free grace the whole of his salvation. Nor, indeed, can we let this doctrine go without giving up, at the same time, the greatest part, if not all, of the essential doctrines of the Christian faith. If we give this up, we cannot defend either justification by the merits of Christ, or the renewal of our natures by his Spirit.

Original Sin, Part VI