From George Mueller's own pen:
I had been much opposed to the doctrines of election, particular redemption, and final persevering grace; so much so that, a few days after my arrival at Teignmouth, I called election a devilish doctrine. I did not believe that I had brought myself to the Lord, for that was too manifestly false; but yet I held, that I might have resisted finally. And further, I knew nothing about the choice of God's people, and did not believe that the child of God, when once made so, was safe for ever. In my fleshly mind I had repeatedly said, If once I could prove that I am a child of God for ever, I might go back into the world for a year or two, and then return to the Lord, and at last be saved. But now I was brought to examine these precious truths by the word of God. Being made willing to have no glory of my own in the conversion of sinners, but to consider myself merely as an instrument; and being made willing to receive what the Scriptures said; I went to the Word, reading the New Testament from the beginning, with a particular reference to these truths. To my great astonishment I found that the passages which speak decidedly for election and persevering grace, were about four times as many as those which speak apparently against these truths; and even those few, shortly after, when I had examined and understood them, served to confirm me in the above doctrines. (Mueller,
A Narrative of Some of the Lord's Dealings with George Müller, Part 1.) (
source)