Seldom have I so inly comprehended

Seldom have I so inly comprehended
With a deep sense so awful and so rude
My complete being's complete solitude
In all its arid loneliness extended

So wholly solitude, so much unblended
With aught else, good or ill, that might intrude
Upon its horror limitless and nude
Whereat my reason reels, not by (...) defended.
And save it from itself (…)