Calvin worked himself nearly to death. As Christian History notes, when he could not walk the couple of hundred yards to church, he was carried in a chair to preach. When the doctor forbade him to go out in the winter air to the lecture room, he crowded the audience into his bedroom and gave lectures there. To those who would urge him to rest, he asked, “What? Would you have the Lord find me idle when he comes?”

Today is the 504th anniversary of the birth of John Calvin (July 10, 1509). Here are nine things you should know about the French theologian and Reformer.

1. From an early age, Calvin was a precocious student who excelled at Latin and philosophy. He was prepared to go to study of theology in Paris, when his father decided he should become a lawyer. Calvin spend half a decade at the University of Orleans studying law, a subject he did not love.

2. Calvin wrote his magnum opus, The Institutes of the Christian Religion, at the age of 27 (though he updated the work and published new editions throughout his life). The work was intended as an elementary manual for those who wanted to know something about the evangelical faith—”the whole sum of godliness and whatever it is necessary to know about saving doctrine.”

3. Calvin initially had no interest in being a pastor. While headed to Strasbourg he made a detour in Geneva where he met the local church leader William Farel. Calvin said he was only staying one night, but Farel argued that it was God’s will he remain in the city and become a pastor. When Calvin protested that he was a scholar, not a preacher, Farel swore a great oath that God would curse all Calvin’s studies unless he stayed in Geneva. Calvin later said, “”I felt as if God from heaven had laid his mighty hand upon me to stop me in my course—and I was so terror stricken that I did not continue my journey.”

4. Calvin was a stepfather (he married a widow, Idelette, who had two children) but had no surviving children himself. His only son, Jacques, was born prematurely and survived only briefly. When his wife died he wrote to his friend, Viret:

I have been bereaved of the best friend of my life, of one who, if it has been so ordained, would willingly have shared not only my poverty but also my death. During her life she was the faithful helper of my ministry. From her I never experienced the slightest hindrance.

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