“The great Zen master Rinzai, in order to take his students' attention away from time, would often raise his finger and slowly ask: "What, at this moment, is lacking?" A powerful question that does not require an answer on the level of the mind. It is designed to take your attention deeply into the Now. A similar question in the Zen tradition is this: "If not now, when?"”

Source: What is Property? (1840), Ch. I: "Method Pursued in this Work. The Idea of a Revolution"
Context: If I were asked to answer the following question: What is slavery? and I should answer in one word, It is murder, my meaning would be understood at once. No extended argument would be required to show that the power to take from a man his thought, his will, his personality, is a power of life and death; and that to enslave a man is to kill him. Why, then, to this other question: What is property! may I not likewise answer, It is robbery, without the certainty of being misunderstood; the second proposition being no other than a transformation of the first?
I undertake to discuss the vital principle of our government and our institutions, property: I am in my right. I may be mistaken in the conclusion which shall result from my investigations: I am in my right. I think best to place the last thought of my book first: still am I in my right.

Gödel, Escher, Bach: an Eternal Golden Braid (1979)

Source: The Hitchhiker's Guide to the Galaxy

Preface to Masterworks of Discovery series (2011)

The Power of Now (1997)

The Paris Review interview (1982)
Context: My Zen master, because I’ve studied Zen for a long time, told me that every one (and all the stories weren’t written then) of the Mary Poppins stories is in essence a Zen story. And someone else, who is a bit of a Don Juan, told me that every one of the stories is a moment of tremendous sexual passion, because it begins with such tension and then it is reconciled and resolved in a way that is gloriously sensual. … A great friend of mine at the beginning of our friendship (he was himself a poet) said to me very defiantly, “I have to tell you that I loathe children’s books.” And I said to him, “Well, won’t you just read this just for my sake?” And he said grumpily, “Oh, very well, send it to me.” I did, and I got a letter back saying: “Why didn’t you tell me? Mary Poppins with her cool green core of sex has me enthralled forever.”