“The most common place crime is often the most mysterious, because it presents no new or specific features from which deductions may be drawn”

“It is a mistake to confound strangeness with mystery. The most commonplace crime is often the most mysterious because it presents no new or special features from which deductions may be drawn. This murder would have been infinitely more difficult to unravel had the body of the victim been simply found lying in the roadway without any of those outré and sensational accompaniments which have rendered it remarkable. These strange details, far from making the case more difficult, have really had the effect of making it less so.”

“The manner in which Epictetus, Montaigne, and Salomon de Tultie wrote, is the most usual, the most suggestive, the most remembered, and the oftener quoted; because it is entirely composed of thoughts born from the common talk of life.”

“Allah-U-Akbar (God is great) is the most frightening word, because it always reminds me that someone is committing crime;specifically murder.”

“The suppression of uncomfortable ideas may be common in religion or in politics, but it is not the path to knowledge, and there's no place for it in the endeavor of science. We do not know beforehand where fundamental insights will arise from about our mysterious and lovely solar system. The history of our study of our solar system shows us clearly that accepted and conventional ideas are often wrong, and that fundamental insights can arise from the most unexpected sources.”

“As a rule, the more bizarre a thing is the less mysterious it proves to be. It is your commonplace, featureless crimes which are really puzzling, just as a commonplace face is the most difficult to identify.”