John Calvin rejected the "Free Offer of the Gospel" (1st Point of Common Grace)

Common grace is an Arminian concept utilized by advocates of human free will and synergism. Common Grace advocates teach that God purposes to save the reprobates in a decretal sense, and this is why Calvinism rejects Arminianism. Because the free willers chose the term 'free offer of the gospel' to represent their synergism, some think the old Protestants and Reformers may have taught this nonsense when they see them say that God freely offered the Gospel to this group or that group. Calvin never taught that God desired the salvation of the reprobates in a decretal sense, as Common Grace proponents teach.