“After much effort, as names, definitions, sights, and other data of sense, are brought into contact and friction one with another, in the course of scrutiny and kindly testing by men who proceed by question and answer without ill will, with a sudden flash there shines forth understanding about every problem, and an intelligence whose efforts reach the furthest limits of human powers.”

The Principles of Success in Literature (1865)
Context: Every one who has seriously investigated a novel question, who has really interrogated Nature with a view to a distinct answer, will bear me out in saying that it requires intense and sustained effort of imagination. The relations of sequence among the phenomena must be seen; they are hidden; they can only be seen mentally; a thousand suggestions rise before the mind, but they are recognised as old suggestions, or as inadequate to reveal what is sought; the experiments by which the problem may be solved have to be imagined; and to imagine a good experiment is as difficult as to invent a good fable, for we must have distinctly present — clear mental vision — the known qualities and relations of all the objects, and must see what will be the effect of introducing some new qualifying agent. If any one thinks this is easy, let him try it: the trial will teach him a lesson respecting the methods of intellectual activity not without its use.

Source: The Unbearable Lightness of Being

Source: The Principles of State and Government in Islam (1961), Chapter 3: Government By Consent And Consent, p 48

This fact must be grasped first and foremost: unless it is understood, we cannot advance. We must know how to supplement and amend old "formulas".
Lenin Anthology, p. 301
1910s, "The Dual Power" (1917)

Beyond the Veil
Context: To me has been granted a somewhat unusual experience of life. Ninety full years have been measured off to me, their lessons and opportunities unabridged by wasting disease or gnawing poverty. I have enjoyed general good health, comfortable circumstances, excellent company, and the incitements to personal effort which civilized society offers to its members. For this life and its gifts I am, I hope, devoutly thankful. I came into this world a hopeless and ignorant bit of humanity. I have found in it many helps toward the attainment of my full human stature, material, mental, moral. In this slow process of attainment many features have proved transient. Visions have come and gone. Seasons have bloomed and closed, passions have flamed and faded. Something has never left me. My relation to it has suffered many changes, but it still remains, the foundation of my life, light in darkness, consolation in ill fortune, guide in uncertainty.
In the nature of things, I must soon lose sight of this sense of constant metamorphosis whose limits bound our human life. How about this unchanging element? Will it die when I shall be laid in earth? The visible world has no answer to this question. For it, dead is dead, and gone is gone. But a deep spring of life within me says: "Look beyond. Thy days numbered hitherto register a divine promise. Thy mortal dissolution leaves this promise unfulfilled, but not abrogated. Thou mayst hope that all that made thy life divine will live for thine immortal part."
I have quoted Theodore Parker's great word, and have made no attempt, so far, to bring into view considerations which may set before us the fundamental distinction between what in human experience passes and what abides.

Ash Wednesday General Audience (1 March 2017), as quoted in "Pope Francis: ‘we do not go to heaven in a carriage’" at Vatican Radio (1 March 2017) http://en.radiovaticana.va/news/2017/03/01/pope_francis_‘we_do_not_go_to_heaven_in_a_carriage’_/1295741
2010s, 2017
Context: Every step, every effort, every test, every fall and every recovery has a sense within God’s design for salvation, as He wants life – not death – and joy – not pain – for His people … This doesn’t mean that he did everything and we don’t have to do anything.

Source: Ideas have Consequences (1948), p. 77.

"The Problem of Increasing Human Energy", The Century (Jun 1900), 211. Collected in The Century (1900), Vol. 60, 211

Source: The Demon-Haunted World: Science as a Candle in the Dark