"If he could but once set eyes on him, he thought the mystery would lighten and perhaps roll altogether away, as was the habit of mysterious things when well examined."
Utterson is trying to convince himself that once he sees Hyde, he will be able to free himself from his curiosity about him, which is growing by the hour. Utterson's confidence that rational examination of the facts would clear up the mystery highlights his position as a respectable lawyer in the Victorian era. The story throws this common Victorian assumption into question, as rational examination fails to satisfy many of the characters in the face of mysterious, supernatural events.