Strikes me a fellow ought to use his insight, not just a chest of tools, to make discoveries.
It was praised in Paris and Brussels and Cambridge as much as in New York, for its insight and for "the clarity and to perhaps be unscientifically enthusiastic, the sheer delight and style of its presentation," as Professor Berkeley Wurtz put it; which may be indicated by quoting the first paragraph of the paper: In a preliminary publication, I have reported a marked qualitative destructive effect of the radiations from radium emanations on Bacteriophage-anti-Shiga.
There are no more uses of "insight" in the book.
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The book is full of insight on human nature.
The study offers further insight into the Palestinian situation.