“I think I exist, therefore I exist. I think.”

Source: Striking Thoughts (2000), p. 21
Context: If thought exists, I who think and the world about which I think also exist; the one exists but for the other, having no possible separation between them. Therefore, the world and I are both in active correlation; I am that which sees the world, and the world is that which is seen by me. I exist for the world and the world exists for me. … One sure and primary and fundamental fact is the joint existence of a subject and of its world. The one does not exist without the other. I acquire no understanding of myself except as I take account of objects, of the surroundings. I do not think unless I think of things — and there I find myself.

Quoted in an artwork, also depicting Wales, in the 2018 exhibition 'Internet Giants : Masters of the Universe' by Langlands & Bell.

Source: The Infernal Desire Machines of Doctor Hoffman

No clear citations of this to Ben-Gurion have been located. A very early variant of this idea (which plays upon the statement of René Descartes "Cogito ergo sum" — "I think, therefore I exist") is found in Die Weimarer Reichsverfassung http://books.google.gr/books?id=VRBAAAAAYAAJ&q= (1922) by Leo Wittmayer, p. 255, a work about the Weimar Constitution, where Wittmayer speaks against the attitude, while stating it in Latin: "bello ergo sum".
Misattributed

A veces creo que no existe todo lo que veo. Porque todo lo que veo es todo lo que vi. Y todo lo que vi no existe.
Voces (1943)

Ma pensée, c'est moi: voilà pourquoi je ne peux pas m'arrêter. J'existe parce que je pense … et je ne peux pas m'empêcher de penser.
Lundi ("Monday")
Nausea (1938)

Interviewed by Dan Warburton, July 8, 1995. http://www.paristransatlantic.com/magazine/interviews/birtwistle.html