From CS Lewis less than a year after his conversion, circa 1928:
During my afternoon “meditations,”—which I at least attempt quite regularly now—I have found out ludicrous and terrible things about my own character. Sitting by, watching the rising thoughts to break their necks as they pop up, one learns to know the sort of thoughts that do come.
And, will you believe it, one out of every three is the thought of self-admiration: when everything else fails, having had its neck broken, up comes the thought “what an admirable fellow I am to have broken their necks!” I catch myself posturing before the mirror, so to speak, all day long. I pretend I am carefully thinking out what to say to the next pupil (for his good, of course) and then suddenly realize I am really thinking how frightfully clever I'm going to be and how he will admire me...
And then when you force yourself to stop it, you admire yourself for doing that. It is like fighting the hydra... There seems to be no end to it. Depth under depths of self-love and self-admiration. (quoted in The Narnian by Alan Jacobs, 133)
From Jonathan Edwards in Religious Affections, circa 1740's:
If on the proposal of the question [Are you humble?], you answer, “No, it seems to me, none are so bad as I.” Don't let the matter pass off so; but examine again, whether or no you don't think yourself better than others on this very account, because you imagine you think so meanly of yourself. Haven't you a high opinion of this humility? And if you answer again, “No; I have not a high opinion of my humility; it seems to me I am as proud as the devil”; yet examine again, whether self-conceit don't rise up under this cover; whether on this very account, that you think yourself as proud as the devil, you don't think yourself to be very humble. (quoted from the online works of Jonathan Edwards)