"The Papists' hold that man, through his own free will, returns to God; and on this point is our greatest contest with them at this day." - John Calvin, Commentary on Jeremiah (Jeremiah 31:19)
"CANON V. If any one saith, that, since Adam's sin, the free will of man is lost and extinguished; or, that it is a thing with only a name, yea a name without a reality, a figment, in fine, introduced into the Church by Satan; let him be anathema." - The (Roman Catholic) Council of Trent: Canons on Justification
The Synod Of Dordt Condemned Arminianism as Heresy https://crta.org/the-synod-of-dordt-condemned-arminianism/ Dordt stated the Arminian Articles and Arminius “summon back from hell the Pelagian error", “contradict #Scripture” and “nullifies the very #grace of #justification & #regeneration.”
"I have my own private opinion that there is no such thing as preaching Christ and Him crucified, unless we preach what nowadays is called Calvinism. It is a nickname to call it Calvinism; Calvinism is the gospel, and nothing else." - Charles Spurgeon, A Defense of Calvinism
"The charge on which many of the Protestant martyrs were burnt at the stake was that they held to the doctrine of predestination & rejected the Arminian and Popish doctrine of free-will." - Augustus Toplady (on the Puritan Hard Drive)
"I will go as far as Martin Luther, in that strong assertion of his, where he says, 'If any man doth ascribe of salvation, even the very least, to the free will of man, he knoweth nothing of grace, and he hath not learnt Jesus Christ aright.'It may seem a harsh sentiment; but he who in his soul believes that man does of his own free will turn to God, cannot have been taught of God, for that is one of the first principles taught us when God begins with us, that we have neither will nor power, but that He gives both; that he is 'Alpha and Omega' in the salvation of men." - Charles Spurgeon, Sermons, Vol. 1, p. 395, Free Will A Slave (1855), emphases added
Free will is "corrupted nature's deformed darling, the Pallas or beloved self-conception of darkened minds." - John Owen, Works, Vol. 10, p. 150, on the Puritan Hard Drive