“The universe is a thought of God.”
Letter 4: Theosophy of Julius, Variant portion: "The universe is one of God's thoughts".
The Philosophical Letters
Context: The universe is a thought of God. After this ideal thought-fabric passed out into reality, and the new-born world fulfilled the plan of its Creator—permit me to use this human simile—the first duty of all thinking beings has been to retrace the original design in this great reality; to find the principle in the mechanism, the unity in the compound, the law in the phenomenon, and to pass back from the structure to its primitive foundation. Accordingly to me there is only one appearance in nature—the thinking being. The great compound called the world is only remarkable to me because it is present to shadow forth symbolically the manifold expressions of that being. All in me and out of me is only the hieroglyph of a power which is like to me. The laws of nature are the cyphers which the thinking mind adds on to make itself understandable to intelligence—the alphabet by means of which all spirits communicate with the most perfect Spirit and with one another. Harmony, truth, order, beauty, excellence, give me joy, because they transport me into the active state of their author, of their possessor, because they betray the presence of a rational and feeling Being, and let me perceive my relationship with that Being.
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Friedrich Schiller 111
German poet, philosopher, historian, and playwright 1759–1805Related quotes

“The universe is made of our thoughts. Our thoughts are infinite.”
Excerpt from the poem Celestial Son in the book Dark Letter Days: Collected Works (2016) by Lorin Morgan-Richards.

De Abaitua interview (1998)

“The universe itself is God and the universal outpouring of its soul”
As quoted in De Natura Deorum by Cicero, i. 15.

“God’s Son,” p. 105
The Sun Watches the Sun (1999), Sequence: “Is It Possible to Write a Poem”

As quoted in Omnipotence and Other Theological Mistakes by Charles Hartshorne (1984)
Context: Appealing to his [Einstein's] way of expressing himself in theological terms, I said: If God had wanted to put everything into the universe from the beginning, He would have created a universe without change, without organisms and evolution, and without man and man's experience of change. But he seems to have thought that a live universe with events unexpected even by Himself would be more interesting than a dead one.

“If God could tell the story of the Universe, the Universe would become fictitious.”
Source: Aspects of the Novel (1927), Chapter Three: People

“There is a lifetime in a moment, a world in a seed and a universe in a thought.”