“I do not serve the god of the Arminians at all; I have nothing to do with him, and I do not bow down before the Baal they have set up; he is not my God, nor shall he ever be; I fear him not, nor tremble at his presence… The God that saith today and denieth tomorrow, that justifieth today and condemns the next… is no relation to my God in the least degree. He may be a relation of Ashtaroth or Baal, but Jehovah never was or can be his name.” – C.H. Spurgeon

“They are Arminians to a man; they deny the absolute sovereignty of God, his eternal choice of an elect people, and that Christ bore their sins only. They deny the total depravity of man, for they insist that he possesses a free will and can accept Christ and besaved by a decision of his own; thus directly repudiating God’s word,as found in John1:13; 6;44; 8:36; Rom 9:16, and other passages. And where any teacher or preacher is unsound on these basic truths, no confidence must be placed on him on any other subject. If he is all wrong at the foundations, his superstructure is bound to be faulty.” – A. W. Pink, Letter to Lowell Green August 19, 1934

“A “god” whose will is resisted, whose designs are frustrated, whose purpose is checkmated, possesses no title to Deity, and so far from being a fit object of worship, merits nought but contempt.” – A. W. Pink

Having said that, while the doctrines of Arminianism are to be rightly despised, maturity and balance is needed concerning how we view Arminians. See this article here, and this one here.

The same Spurgeon who wrote so forcefully about Arminianism (above) also said this:

“We give our hand to every man that loves the Lord Jesus Christ, be he what he may or who he may. The doctrine of election, like the great act of election itself, is intended to divide, not between Israel and Israel, but between Israel and the Egyptians, not between saint and saint, but between saints and the children of the world. A man may be evidently of God’s chosen family, and yet though elected, may not believe in the doctrine of election. I hold that there are many savingly called, who do not believe in effectual calling, and that there are a great many who persevere to the end, who do not believe the doctrine of final perseverance. We do hope the hearts of many are a great deal better than their heads. We do not set their fallacies down to any willful opposition to the truth as it is in Jesus but simply to an error in their judgments, which we pray God to correct. We hope that if they think us mistaken too, they will reciprocate the same Christian courtesy; and when we meet around the cross, we hope that we shall ever feel that we are one in Christ Jesus.”

“I do not ask whether you believe Calvinism. It is possible that you do not. But I believe you will before you enter heaven. I am persuaded that as God may have washed your hearts, He will wash your brains before you enter heaven.” – Spurgeon, Sermons, Vol. 1, p. 92