I started reading Cost-Based Oracle Fundamentals by Jonathan Lewis last night. In the very beginning he suggests reading the book in its entirety as a first pass and then reading it again for more detail.
"Bah", I thought to myself, "I need to get on to Tom Kyte's book, I don't have time to read it twice."
On page 2 I pulled out the highlighter.
Page 6, eight highlighted passages.
By page 9 I had abandonded the highlighter and proceeded with casual reading. Tom will have to wait.