He was obsessed by the idea that no one could do anything as well as he could.
"The Pioneers"
Katharine Susannah Prichard
Now, if that is the case, she might be characterized as a radical "wet", obsessed on that one question, and forgetful and more or less incompetent on everything else.
"Epistles-from-Pap-Letters-from-the-man-known-as-The-Will-Rogers-of-Indiana"
Durham, Andrew Everett
His mind became so obsessed with this idea that he became nervous, and his peace of mind vanished.
"If Any Man Sin"
H. A. Cody