Johann von Dollinger
Historically nothing is more incorrect than the assertion that the Reformation was a movement in favour of intellectual freedom. The exact contary is the truth. For themselves, it is true, Lutherans and Calvinists claimed liberty of conscience . . . but to grant it to others never occurred to them so long as they were the stronger side. The complete extirpation of the Catholic Church, and in fact of everything that stood in their way, was regarded by the reformers as something entirely natural.
(Grisar, VI, 268-269; Dollinger: Kirche und Kirchen, 1861, 68)
Hartmann Grisar
At Zurich, Zwingli’s State-Church grew up much as Luther’s did . . . Oecolampadius at Basle and Zwingli’s successor, Bullinger, were strong compulsionists. Calvin’s name is even more closely bound up with the idea of religious absolutism, while the task of handing down to posterity his harsh doctrine of religious compulsion was undertaken by Beza in his notorious work, On the Duty of Civil Magistrates to Punish Heretics. The annals of the Established Church of England were likewise at the outset written in blood.
(Grisar, VI, 278)
Will Durant (S)
Calvin was as thorough as any pope in rejecting individualism of belief; this greatest legislator of Protestantism completely repudiated that principle of private judgment with which the new religion had begun. He had seen the fragmentation of the Reformation into a hundred sects, and foresaw more; in Geneva he would have none of them.
(Durant, 473)
ic.net/~erasmus/RAZ247.HTM