Quote 34
And still the figure had no face by which he might know it; even in his dreams, it had no face, or one that baffled him and melted before his eyes; and thus it was that there sprang up and grew apace in the lawyer's mind a singularly strong, almost an inordinate, curiosity to behold the features of the real Mr. Hyde. 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. (2.13)
Mr. Utterson is a curious person, but also very rational and not disposed toward supernatural explanations. He believes that mysteries can be solved by thorough inquiry.
Quote 35
From that time forward, Mr. Utterson began to haunt the door in the by-street of shops. In the morning before office hours, at noon when business was plenty, and time scarce, at night under the face of the fogged city moon, by all lights and at all hours of solitude or concourse, the lawyer was to be found on his chosen post. (2.14)
Mr. Utterson is a man who acts on his curiosity, unlike Mr. Enfield.
Quote 36
A great curiosity came on the trustee, to disregard the prohibition and dive at once to the bottom of these mysteries; but professional honour and faith to his dead friend were stringent obligations; and the packet slept in the inmost corner of his private safe. (6.12)
Mr. Utterson’s moral code supersedes any stirrings of curiosity.