Horatio in Act 1

One instance that I found change within Horatio is when he says "Before my God, I might not this believe/ Without the sensible and true avouch/ Of mine own eyes" (1.1.66-68) meaning that he will not believe in this ghost or apparition until he sees it with his own eyes. The change occurs when Horatio later says "A mote it is to trouble the mind's eye./ In the most high and palmy state of Rome,/....As harbingers preceding still the fates/ And prologue to the omen coming on,/" (1.1.124-136) explaining that the people need to be worried about this ghost that he now believes to be in existence. He later interacts with the ghost causing him to definitely have no more doubts about this apparition.