Against lax views of Socinian tendency he directed his able treatise De duabus naturis in Christo (1570).
It was this rationalistic treatment of the sacred writings which helped to confound the Cartesians with the allegorical school of John Cocceius, as their liberal doctrines in theology justified the vulgar identification of them with the heresies of Socinian and Arminian.
His Summa universae theologiae secundum Unitarios (1787), Socinian with Arminian modifications, was accepted by Joseph II.
A Socinian Bible was issued by Simon Budny in 1570 at Nieswiez, as he professed to find many faults in the version issued under the patronage of Radziwill; in 1597 appeared the Roman Catholic version of the Jesuit Wujek; and in 1632 the so-called Danzig Bible, which is in use among Protestants and is still the most frequently reprinted.
I.-iv.), affirmed the Three .Creeds (vii.), since many Anabaptists held Arian and Socinian opinions which were rife in Switzerland, Italy and Poland, condemning also their views on original sin (viii.), community of goods (xxxvii.), and on other subjects in articles which do not mention them by name.
In 1793 he published a treatise, The Calvinistic and Socinian systems examined and compared as to their moral tendency, in which he rebutted the accusation of antinomianism levelled by the Socinians against those who over-emphasized the doctrines of free grace.
The History of Arianism was published in English (1728-1729) by William Webster, with an appendix on the English writers in the Socinian and Arian controversies.
In1652-1654and1658-1662Biddle held a Socinian conventicle in London; in addition to his own writings he reprinted (1651) and translated (1652) the Racovian Catechism, and the Life of Socinus (1653).
It is noteworthy that in England the Socinian controversy, initiated by Biddle, preceded the Arian controversy initiated by Samuel Clarke's Scripture Doctrine of the Trinity (1712).
At Rakow in Poland was published the catechism of the Socinian doctrines in 1605.