The doctrines of original sin, election, and effectual calling, final perseverance, and all those great truths which are called Calvinism – though Calvin was not the author of them, but simply an able writer and preacher upon the subject – are, I believe, the essential doctrines of the gospel that is in Jesus Christ. Now, I do not ask you whether you believe all this – it is possible you may not; but I believe you will before you enter heaven.

Author: Charles Haddon Spurgeon