“As a technology, the book is like a hammer. That is to say, it is perfect: a tool ideally suited to its task. Hammers can be tweaked and varied but will never go obsolete. Even when builders pound nails by the thousand with pneumatic nail guns, every household needs a hammer.”

Egwene al'Vere
(15 October 1991)

Source: Introduction to the New Existentialism (1966), p. 92

The Psychology of Science: A Reconnaissance (1966), Ch. 2, p. 15; although some similar statements to describe fundamental errors in human perception have been attributed to others, his expression, or slight paraphrases of it, is one of the earliest yet found to be documented in published writings, and remains among the most popular.
1940s-1960s

Alternate version: If you don't have a hammer, you don't want anything to look like a nail.
Of Paradise and Power, p. 26
According to Kagan, this is a variation of the proverb "When you have a hammer, all problems start to look like nails." (p. 25 of the same book)

Source: Immortal Beloved

Cave on his interest in Eastern and nontheistic spirituality
God and religion