A pastor I know had been studying Calvinism a number of years ago and decided to teach the five points in a Wednesday evening class. Toward the end he revealed that he had become convinced that four of them were true, but he was struggling with limited atonement. One girl in the class pointed out that if the other four were true, that the fifth followed logically if not for the same scriptural reasons. Considering it, he agreed and he's been a solid five-pointer ever since.
Thanks for that account! John 17 did it for me.