The first quotation by Jay Friedenberg means that the human brain is too complex to easily explain.
The second quotation means that Strange de Jim has short attention span which he worries about, but soon forgets about it.
A quotation is the rendering of the words of another, using inverted commas to show that they are the words of someone else.
From the first quotation, Mr.Friedenberg believes that the human brain is too complex for only one theory to accurately describe.
According to the second quotation, Mr. de Jim talks about his short attention span, which does not even allow him worry about it for very long, before his attention shifts to something else.
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