Teachings of David O. McKay, pg. 91; “His declaration was simple but positive; and he was surprised when men doubted its truth. To him his claim was but the statement of a simple fact; to the Christian world it proved to be a lightning flash that, striking, weakened their religious structure from turret to foundation.”
John 12:48; “He that rejecteth me, and receiveth not my words, hath one that judgeth him: the word that I have spoken, the same shall judge him in the last day.”
Smith wasn’t surprised, he was mad that people found him out.