“Rational adventure in a physical setting is becoming increasingly rarer in the world. The evolution of technology and infrastructure has altered the kind of adventures that we can have, so that people with adventurous spirits either take on risk for its own sake, or they embark on rational adventures in the mental domain.”

1950s, Conversations With Artists, 1957

As quoted in Building A Life Of Value : Timeless Wisdom to Inspire and Empower Us (2005) by Jason A. Merchey, p. 74

"The evolution of adventure in literature and life or Will there ever be a good adventure novel about an astronaut?"

Source: The Faith of Leap (2011), p. 206.

Foreword to My Dangerous Desire: A Queer Girl Dreaming Her Way Home by Amber L. Hollibaugh, pg. xii.
Context: I want to write a great book — I want to make a difference — I want to have adventures and take enormous risks and be everything they say we are and not give a damn what anyone says.

Source: Wild Ducks Flying Backward

Variant: It's true that adventures are good for people even when they are very young. Adventures can get in a person's blood even if he doesn't remember having them.
Source: The Secret of Platform 13

Cord and Erasmas, Part 6, "Peregrin"
Anathem (2008)