Introduction
Higher Mathematics for Chemical Students (1911)
“Neglecting to broaden their view has kept some people doing one thing all their lives.”
Source: Think and Grow Rich: The Landmark Bestseller - Now Revised and Updated for the 21st Century
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Napoleon Hill 104
American author 1883–1970Related quotes
“It does not do to neglect the gods of a place, whoever they may be. In the end, they are all one.”
Source: Mary Stewart's Merlin Trilogy

Cavett http://books.google.com/books?id=CE4NAQAAMAAJ&q=%22You+can+after+all+reduce+the+reasons+for+watching+TV+to+but+two+to+be+lulled+and+to+be+stimulated+Some+people+do+one+sometimes+the+other+sometimes+Some+people+do+all+of+one+or+all+of+the+other%22&pg=PA331#v=onepage, co-authored with Christopher Porterfield (1974)
Excerpted in New York magazine July 22, 1974 http://books.google.com/books?id=kekCAAAAMBAJ&q=%22You+can+after+all+reduce+the+reasons+for+watching+TV+to%22+%22two+to+be+lulled+and+to+be+stimulated+Some+people+do+one+sometimes+the+other+sometimes+Some+people+do+all+of+one+or+all+of+the+other%22&pg=PA34#v=onepage
Three Worlds, Three Summers — But Not the Summer Just Past (1949).
Context: One might think, to hear some people talk, that this had been a particularly fine summer. From their point of view, I suppose, it has. They have rushed about the lakes in noisy little boats; they have permitted themselves to be dragged behind other little boats, standing more or less upright on ironing boards; they have immersed themselves in lakes into which countless summer cottage privies drain; they have laboriously pursued summer flirtations, and some of them have achieved gritty conquests on the sands; they have sat in hot little boats waiting to catch fish which they have then had to eat; they have passed many hours changing their skins from pinkish-drab to brown, erroneously believing that they are "storing up sunshine" against the winter months; they have motored penitential distances; they have taken thousands of feet of film of people whose names they will not be able to remember in November. They have amused themselves after their fashion, and I have no quarrel with them.

Preface
A Book of Travel to Three Continents (Translated from Dahri) (1914)

“I'd learned that some things are best kept secret.”
Source: Dear John