This quote means to describe the root of the deprecation of many people to properly conduct an investigation about any subject, and that root is lack of interest. In order to do something right, one must concentrate on that subject alone, ignoring all other distractions, but that can only be achieved if the investigator feels drawn to the subject - meaning they find it interesting.
Lack of interest is what accomplishes to "keep a man in everlasting ignorance...". In the case of ignorance, the investigation might go through, but it will most likely consist of a mindlessly structured compilation of other people's research which the investigator would hardly be able to interpret.
I have an idea.. ok so the setting could be in a camp and then one by one people start to die because of a vengeful demon bear
THIRD PERSON: Lefty was not impressed with his brother’s car.. .
SECOND PERSON: You decided you...
FIRST PERSON: There was a time when I to...
THIRD PERSON: When Clare decided...
FIRST PERSON: The new kid...
SECOND PERSON: The salesman...
C. Claims that he will not allude to the recipient's dependence on him while actually emphasizing it.
Hope this helps!