“The shortest and surest way of arriving at real knowledge is to unlearn the lessons we have been taught, to mount the first principles, and take nobody's word about them.”

Second Inaugural Address (4 March 1893).

"Fall of a City"
Selected Poems (1941)
Context: All the lessons learned, unlearned;
The young, who learned to read, now blind
Their eyes with an archaic film;
The peasant relapses to a stumbling tune
Following the donkey`s bray;
These only remember to forget. But somewhere some word presses
On the high door of a skull and in some corner
Of an irrefrangible eye
Some old man memory jumps to a child
— Spark from the days of energy.
And the child hoards it like a bitter toy.

Speech to a joint session of the United States Congress, Washington, D.C. (26 December 1941) http://www.winstonchurchill.org/learn/speeches/speeches-of-winston-churchill/1941-1945-war-leader/288-us-congress-1941.
The Second World War (1939–1945)
Context: When we consider the resources of the United States and the British Empire compared to those of Japan, when we remember those of China, which has so long and valiantly withstood invasion and when also we observe the Russian menace which hangs over Japan, it becomes still more difficult to reconcile Japanese action with prudence or even with sanity. What kind of a people do they think we are? Is it possible they do not realise that we shall never cease to persevere against them until they have been taught a lesson which they and the world will never forget?
Members of the Senate and members of the House of Representatives, I turn for one moment more from the turmoil and convulsions of the present to the broader basis of the future. Here we are together facing a group of mighty foes who seek our ruin; here we are together defending all that to free men is dear. Twice in a single generation the catastrophe of world war has fallen upon us; twice in our lifetime has the long arm of fate reached across the ocean to bring the United States into the forefront of the battle. If we had kept together after the last War, if we had taken common measures for our safety, this renewal of the curse need never have fallen upon us.
Do we not owe it to ourselves, to our children, to mankind tormented, to make sure that these catastrophes shall not engulf us for the third time?

Letter to Christian Northoff (1497), as translated in Collected Works of Erasmus (1974), p. 114

Heaven On Earth, 1654

Creation seminars (2003-2005), Dinosaurs and the Bible

Source: Sartre: Romantic Rationalist (1953), Ch. 10, p. 148 (the concluding sentence of the book)

(1836-1) (Vol.46) Experience
The Monthly Magazine