“Eternal childhood. Life calls again.
It is entirely conceivable that life’s splendour forever lies in wait about each one of us in all its fullness, but veiled from view, deep down, invisible, far off. It is there, though, not hostile, not reluctant, not deaf. If you summon it by the right word, by its right name, it will come. This is the essence of magic, which does not create but summons.”

(18 October 1921)
The Diaries of Franz Kafka 1910-1923 (1948)
Context: Eternal childhood. Life calls again.
It is entirely conceivable that life’s splendour forever lies in wait about each one of us in all its fullness, but veiled from view, deep down, invisible, far off. It is there, though, not hostile, not reluctant, not deaf. If you summon it by the right word, by its right name, it will come. This is the essence of magic, which does not create but summons.

The bold portions are one of seven quotes inscribed on the walls at the gravesite of John F. Kennedy at Arlington National Cemetery.
1961, Inaugural Address
Context: Now the trumpet summons us again — not as a call to bear arms, though arms we need; not as a call to battle, though embattled we are — but a call to bear the burden of a long twilight struggle, year in and year out, "rejoicing in hope, patient in tribulation" — a struggle against the common enemies of man: tyranny, poverty, disease, and war itself. Can we forge against these enemies a grand and global alliance, North and South, East and West, that can assure a more fruitful life for all mankind? Will you join in that historic effort?

2010s
Source: [David, Brooks, http://graduationwisdom.com/speeches/0088-brooks.htm, Commencement Address, May 14, 2011]

The Glass Bead Game (1943)

The Glass Bead Game (1943)

Variant translation: The essence of mathematics is in its freedom.
From Kant to Hilbert (1996)

The Great Code: The Bible and Literature (1981) according to Neil Postman Amusing Ourselves to Death p 13.
"Quotes", The Great Code: The Bible and Literature (1982)

The Caesars (c. 361)
Context: The trial that begins
Awards to him who wins
The fairest prize to-day.
And lo, the hour is here
And summons you. Appear!
Ye may no more delay.
Come hear the herald's call
Ye princes one and all.
Many tribes of men
Submissive to you then!
How keen in war your swords!
But now 'tis wisdom's turn;
Now let your rivals learn
How keen can be your words.