“... there may be a crucial difference between thinking that it would have been better if the world had never come into existence, and thinking that we may take it upon ourselves to destroy the life that already exists.”

Source: Striking Thoughts (2000), p. 21
Context: If thought exists, I who think and the world about which I think also exist; the one exists but for the other, having no possible separation between them. Therefore, the world and I are both in active correlation; I am that which sees the world, and the world is that which is seen by me. I exist for the world and the world exists for me. … One sure and primary and fundamental fact is the joint existence of a subject and of its world. The one does not exist without the other. I acquire no understanding of myself except as I take account of objects, of the surroundings. I do not think unless I think of things — and there I find myself.

The Princess and Curdie (1883)

Vol. XI, p. 62
Posthumous publications, The Collected Works
Context: I think we must see this very clearly right at the beginning — that if one would solve the everyday problems of existence, whatever they may be, one must first see the wider issues and then come to the detail. After all, the great painter, the great poet is one who sees the whole — who sees all the heavens, the blue skies, the radiant sunset, the tree, the fleeting bird — all at one glance; with one sweep he sees the whole thing. With the artist, the poet, there is an immediate, a direct communion with this whole marvellous world of beauty. Then he begins to paint, to write, to sculpt; he works it out in detail. If you and I could do the same, then we should be able to approach our problems — however contradictory, however conflicting, however disturbing — much more liberally, more wisely, with greater depth and colour, feeling. This is not mere romantic verbalization but actually it is so, and that is what I would like to talk about now and every time we get together. We must capture the whole and not be carried away by the detail, however pressing, immediate, anxious it may be. I think that is where the revolution begins.

On Guerilla Warfare http://www.marxists.org/reference/archive/mao/works/1937/guerrilla-warfare/ch06.htm (1937), Chapter 6 - "The Political Problems of Guerilla Warfare"
This is usually aphorized as "The people are the sea that the revolutionary swims in," or an equivalent.

from a transcript of the video interview "Understanding Relativity," published at webofstories.com

Truth and Knowledge http://wn.rsarchive.org/Books/GA003/TaK/GA003_index.html, preface

Parrots, the Universe and Everything (2001)

Source: Who Is Man? (1965), Ch. 5<!-- Existence and expediency, p. 85 -->
Context: Man is naturally self-centered and he is inclined to regard expediency as the supreme standard for what is right and wrong. However, we must not convert an inclination into an axiom that just as man's perceptions cannot operate outside time and space, so his motivations cannot operate outside expediency; that man can never transcend his own self. The most fatal trap into which thinking may fall is the equation of existence and expediency.

A Marriage Made In Heaven; or, Too Tired For an Affair (1993)