John Calvin (1509–1564) was an influential French theologian and pastor during the Protestant Reformation. He was a principal figure in the development of the system of Christian theology later called Calvinism. John Calvin was Martin Luther's successor as the preeminent Protestant theologian. Calvin made a powerful impact on the fundamental doctrines of Protestantism, and is widely credited as the most important figure in the second generation of the Protestant Reformation.
I have always hated the way John Winchester favored Sam. It isn't Dean's fault Mary died. It isn't his fault John hunts. It isn't his fault that Sam is raised in such a crappy situation. It's John's fault. He left Dean alone with Sam whenever he left. He let himself become obsessed with finding Azazel. He put the burden of premature fatherhood on Dean's little shoulders.