it would, as though of design, happen to me not only to feel but to do such ugly things, such that ...

Well, in short, actions that all, perhaps, commit; but which, as though purposely, occurred to me at the very time when I was most conscious that they ought not to be committed. The more conscious I was of goodness and of all that was “sublime and beautiful,” the more deeply I sank into my mire and the more ready I was to sink in it altogether. But the chief point was that all this was, as it were, not accidental in me, but as though it were bound to be so. It was as though it were my most normal condition, and not in the least disease or depravity, so that at last all desire in me to struggle against this depravity passed. It ended by my almost believing (perhaps actually believing) that this was perhaps my normal condition.