Plain English: Am I dull-witted?

The mature and reasonably well educated adult who cannot understand expository writing should not conclude that he is dull-witted or that the subject is too abstruse for him. He should at least entertain the suspicion that the fault lies with the author and that the writing is bad.

Lester S. King, Why Not Say It Clearly 19 (1978).

Granted, I'm not mature. But I am reasonably well educated. So I can stop feeling dull-witted when I read legal stuff?