“Only minutes were required to impress these thoughts indelibly on their minds, for a thought is instantaneous and its grasping depends on its strength and clarity.”

— Desmond Leslie

Source: The Amazing Mr. Lutterworth (1958), p. 211

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Desmond Leslie 10

British pilot, film maker, writer, and musician 1921–2001

Ramesh Balsekar (1917–2009) Indian guru

“A judgment, for me is not the mere grasping of a thought, but the admission of its truth.”

Gottlob Frege Sense and reference

Gottlob Frege (1892). On Sense and Reference, note 7.
Über Sinn und Bedeutung, 1892

“.. the number of the engine [of the train], its profile shown in the upper part of the picture, its wind-cutting fore-part in the center, symbolical of parting, indicates the features of the scene that remain indelibly impressed upon the mind”

Umberto Boccioni (1882–1916) Italian painter and sculptor

of the viewer
Quote from Inventing Futurism: The Art and Politics of Artificial Optimism, by Christine Poggi, Princeton University Press, 2009, p. 21
a note on his tryptich painting, he made late in 1911, containing the canvasses 'States of Mind II', 'The farewells', 'Those Who go Those who Stay'.
1911

“There can be no whole without a thought which grasps it as a whole; and this grasping of what is before the mind as a whole can be effected only by a sort of voluntary halt in a kind of progressive movement of thought.”

Gabriel Marcel (1889–1973) French philosopher, playwright, music critic and leading Christian existentialist

Source: Man Against Mass Society (1952), p. 123

“The relatively small sector of the mind that stands in the intense light of purposeful will and thought is not a reliable standard of the inner strength and lucidity of consciousness in its totality.”

Nyanaponika Thera (1901–1994) German Buddhist monk

Source: The Vision of Dhamma (1994), p. 75

“Creation was not successive; it was one instantaneous thought and act, identical with the will, and was complete and unchangeabble from end to end, including time as one of its functions.”

Henry Adams (1838–1918) journalist, historian, academic, novelist

Mont Saint Michel and Chartres (1904)
Context: Creation was not successive; it was one instantaneous thought and act, identical with the will, and was complete and unchangeabble from end to end, including time as one of its functions. Thomas was as clear as possible on that point:— "Supposing God wills anything in effect, he cannot will not to will it, because his will cannot change." He wills that some things shall be contingent and others necessary, but he wills in the same act that the contingency shall be necessary. "They are contingent because God has willed them to be so, and with this object has subjected them to causes which are so." In the same way he wills that his creation shall develop itself in time and space and sequence, but he creates these conditions as well as the events. He creates the whole, in one act, complete, unchangeable, and it is then unfolded like a rolling panorama with its predetermined contingencies.Man's free choice — liberum arbitrium — falls easily into place as a predetermined contingency. God is the First Cause, and acts in all Secondary Causes directly; but while he acts mechanically on the rest of creation,— as far as is known,— he acts freely at one point, and this free action remains free as far as it extends on that line. Man's freedom derives from this source, but it is simply apparent, as far as he is a cause; it is a [... ] Reflex Action of the complicated mirror [... ] called Mind, and [... ] an illusion arising from the extreme delicacy of the machine.

“A book can never be anything more than the impression of its author’s thoughts.”

Arthur Schopenhauer (1788–1860) German philosopher

The value of these thoughts lies either in the matter about which he has thought, or in the form in which he develops his matter — that is to say, what he has thought about it.
Essays, On Authorship and Style