Sometimes it’s very hard to act on what you know in the face of what you thought you knew. Once you know you know it, you don’t have a choice.
“Of all man’s instruments, the most wondrous, no doubt, is the book. The other instruments are extensions of his body. The microscope, the telescope, are extensions of his sight; the telephone is the extension of his voice; then we have the plow and the sword, extensions of the arm. But the book is something else altogether: the book is an extension of memory and imagination.”
Jorge Luis Borges