Source: The Sayings and Teachings of the Great Mystics of Islam (2004), p. 299
“A person should never be satisfied with a thought God, for when the thought perishes, the God also perishes.”
Der Mensch soll sich nicht genügen lassen an einem gedachten Gott; denn wenn der Gedanke vergeht, so vergeht auch der Gott.
Deutsche Predigten und Traktate (1963), p. 60
Original
Der Mensch soll sich nicht genügen lassen an einem gedachten Gott; denn wenn der Gedanke vergeht, so vergeht auch der Gott.
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Meister Eckhart 69
German theologian 1260–1328Related quotes

Against the Galilaeans (c. 362)
Context: Men's works also are naturally perishable and mutable and subject to every kind of alteration. But since God is eternal, it follows that of such sort are his ordinances also. And since they are such, they are either the natures of things or are accordant with the nature of things. For how could nature be at variance with the ordinance of God? How could it fall out of harmony therewith?

“Yet these shall perish and understand,
For God has pity on this great land.”
Who Goes Home? (1914)
Context: In the city set upon slime and loam,
They cry in their Parliament, "Who goes home?"
And there comes no answer in arch or dome,
For none in the city of graves goes home.
Yet these shall perish and understand,
For God has pity on this great land.

As quoted in "The Status of Annexed Territory and of its Free Civilized Inhabitants" (1901), North American Review, vol. 172, no. 530 (January 1901), p. 22.

Epistle to Muhammad Sháh
Letter Accepting 2018 Andrei Sakharov Prizefrom (2018)
Context: Thoughts and dreams don’t die. Belief in freedom and justice does not perish with imprisonment, torture or even death and tyranny do not prevail over freedom, even when they rely on the power of the state. Sitting here in the prison, I am deeply humbled by the honor you have bestowed on me and I will continue my efforts until we achieve peace, tolerance for a plurality of views, and human rights.
Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 390.

Speech to the University of Toronto (April 1939), quoted in An Interpreter of England. The Falconer Lectures (1939), pp. 117-118.
1939