This is another snippet of Holmes' somewhat depressive thoughts regarding Watson's leaving. I sort of like these, because as I'm writing them I like to imagine that there are countless short little "messages" like this one scrawled onto various pages in books that lay in the floor of their sitting room-little windows into Holmes' soul that are out there in the open just begging for Watson to discover them.
Psychologically Disturbed
I have observed that, when one is most flustered and upset (especially when these two characteristics are combined with any amount of sleep deprivation), those are the times when the words he speaks make the least amount of realistic sense. So much more this is for you, I daresay, dear Watson. In the very least, this is true in my perspective of you.
You asserted that you must be "psychologically disturbed." I am not a tenacious medical man such as yourself, but I cannot but disagree with this analysis.
After all, I think it is clear to both of us that I know very well what psychological disturbances are. Even once, not long before that day we met in Bart's, a medical man from there–one whom I barely knew–told me quite candidly that my behavior was nothing short of psychological imbalances, and that I would do good to report my mannerisms and habits (the same which you so often mention to me) to a specialist so that I might be able to live "normally." I am certain he is not the only one with such opinions.
You, on the other hand, my friend, are one of the soundest men I have ever encountered, speaking in mental, physical, and emotional terms. You are most certainly not suffering from any one of those "ailments" which plague me by way of my formidable intellect. You are good, and honourable–a dark horse. Why you remain with the likes of me is the mystery which I have yet to solve.
Yet, you do, and so I have learnt to be content in that knowledge. My only wish is that whatever mental disorders and psychological disturbances I posses were destined never to repulse you; unfortunately, now they has done just that, and by the end of this week you shall be gone, and I shall be left alone with my vices.