“The last fact which knowledge can discover is that the world is a manifestation, and in every way a puzzling manifestation, of the universal will to live.”

1920s, Tractatus Logico-Philosophicus (1922)
Context: This remark provides the key to the problem, how much truth there is in solipsism. For what the solipsist means is quite correct; only it cannot be said, but makes itself manifest. The world is my world: this is manifest in the fact that the limits of language (of that language which alone I understand) mean the limits of my world. (5.62)

Source: Rules of Sociological Method, 1895, p. 10

On Practice (1937)

1930s, Wisehart interview (1930)
Context: I do not believe in a God who maliciously or arbitrarily interferes in the personal affairs of mankind. My religion consists of an humble admiration for the vast power which manifests itself in that small part of the universe which our poor, weak minds can grasp!

Original: Il fascino di una donna può manifestarsi nel coraggio, nel mistero e nel suo modo di pensare.
Source: prevale.net

"Eckhart, Brethren of the Free Spirit," from Communalism: From Its Origins to the Twentieth Century (1974), ch. 4
Context: The influence of Meister Eckhart is stronger today than it has been in hundreds of years. Eckhart met the problems of contingency and omnipotence, creator-and-creature-from-nothing by making God the only reality and the presence or imprint of God upon nothing, the source of reality in the creature. Reality in other words was a hierarchically structured participation of the creature in the creator. From the point of view of the creature this process could be reversed. If creatureliness is real, God becomes the Divine Nothing. God is not, as in scholasticism, the final subject of all predicates. He is being as unpredicable. The existence of the creature, in so far as it exists, is the existence of God, and the creature’s experience of God is therefore in the final analysis equally unpredicable. Neither can even be described; both can only be indicated. We can only point at reality, our own or God’s. The soul comes to the realization of God by knowledge, not as in the older Christian mysticism by love. Love is the garment of knowledge. The soul first trains itself by systematic unknowing until at last it confronts the only reality, the only knowledge, God manifest in itself. The soul can say nothing about this experience in the sense of defining it. It can only reveal it to others.

Kulturphilosophie (1923), Vol. 2 : Civilization and Ethics
Context: Affirmation of the world, which means affirmation of the will-to-live that manifests itself around me, is only possible if I devote myself to other life. From an inner necessity, I exert myself in producing values and practising ethics in the world and on the world even though I do not understand the meaning of the world. For in world- and life-affirmation and in ethics I carry out the will of the universal will-to-live which reveals itself in me. I live my life in God, in the mysterious divine personality which I do not know as such in the world, but only experience as mysterious Will within myself.
Rational thinking which is free from assumptions ends therefore in mysticism. To relate oneself in the spirit of reverence for life to the multiform manifestations of the will-to-live which together constitute the world is ethical mysticism. All profound world-view is mysticism, the essence of which is just this: that out of my unsophisticated and naïve existence in the world there comes, as a result of thought about self and the world, spiritual self-devotion to the mysterious infinite Will which is continuously manifested in the universe.

(Speaking about Edward Teller)
F*** You! Mr. President: Confessions of the Father of the Neutron Bomb (2006)
Context: He was all in favor of fighting an all-out thermonuclear war that might devastate a fair fraction of civilization, to settle an argument with the USSR, but was dead set against using discriminate nuclear weapons that could settle arguments on the battlefield without devastating everything in sight. Genius, when applied to human problems, can manifest itself in strange ways.

Kulturphilosophie (1923), Vol. 2 : Civilization and Ethics
Context: Affirmation of the world, which means affirmation of the will-to-live that manifests itself around me, is only possible if I devote myself to other life. From an inner necessity, I exert myself in producing values and practising ethics in the world and on the world even though I do not understand the meaning of the world. For in world- and life-affirmation and in ethics I carry out the will of the universal will-to-live which reveals itself in me. I live my life in God, in the mysterious divine personality which I do not know as such in the world, but only experience as mysterious Will within myself.
Rational thinking which is free from assumptions ends therefore in mysticism. To relate oneself in the spirit of reverence for life to the multiform manifestations of the will-to-live which together constitute the world is ethical mysticism. All profound world-view is mysticism, the essence of which is just this: that out of my unsophisticated and naïve existence in the world there comes, as a result of thought about self and the world, spiritual self-devotion to the mysterious infinite Will which is continuously manifested in the universe.