John Henry Cardinal Newman in Apologia Pro Vita Sua describing the sorrows of writing about his conversion:

And now that I am about to trace, as far as I can, the course of that great revolution of mind, which led me to leave my own home, to which I was bound by so many strong and tender ties, I feel overcome with the difficulty of satisfying myself in the account of it, and have recoiled from doing so, till the near approach of the day, on which these lines must be given to the world, forces me to set about the task. For who can know himself, and the multitude of subtle influence which act upon him? and who can recollect, at the distance of twenty-five years, all that he once knew about his thoughts and his deeds, and that, during a portion of his life, when even at the time his observation, whether of himself or of the external world, was less than before or after, by very reason of the perplexity and dismay which weighed upon him,—when, though it would be most unthankful to seem to imply that he had not all-sufficient light amid his darkness, yet a darkness it emphatically was? And who can suddenly gird himself to a new and anxious undertaking, which he might be able indeed to perform well, had he full and calm leisure allowed him to look through everything that he has written, whether in published works or private letters? but, on the other hand, as to that calm contemplation of the past, in itself so desirable, who can afford to be leisurely and deliberate, while he practises on himself a cruel operation, the ripping up of old grief, and the venturing again upon the “infandum dolorem” of years, in which the stars of this lower heaven were one by one going out? I could not in cool blood, nor except upon the imperious call of duty, attempt what I have set myself to do. It is both to head and heart an extreme trial, thus to analyze what has so long gone by, and to bring out the results of that examination. I have done various bold things in my life: this is the boldest: and, were I not sure I should after all succeed in my object it would be madness to set about it.

A dissertation epigraph?