Of True Religion, Heresy, Schism, Toleration; and what best means may be used against the Growth of Popery is an Anti-Catholic polemical tract by John Milton, first published in London in 1673.
The anti-Catholic ideas in Milton's writing are in direct response to the tolerant stance of King Charles II of England toward the Roman Catholic Church.
Milton begins his argument with the claim that "the increase of popery is at this day no small trouble and offence to the greatest part of the nation.
He proposes a solution to the problem, stating that two principles of true religion would "cut off many debates and contentions, schisms, and persecutions"[1] between Christians.
"Milton's tract is tolerant of the sectarians, who ‘may have some errors, but are not heretics’, but mounts a strong attack on Roman Catholicism, which he denounces as politically dangerous and theologically idolatrous.