“If by the time we're sixty we haven't learned what a knot of paradox and contradiction life is, and how exquisitely the good and the bad are mingled in every action we take, and what a compromising hostess Our Lady of Truth is, we haven't grown old to much purpose.”

Answering a toast, "To the Babies," at a banquet in honor of General U.S. Grant (November 14, 1879).
The Writings of Mark Twain, Vol. 20 (1899), ed. Charles Dudley Warner, p. 397 http://books.google.com/books?id=mRARAAAAYAAJ&pg=PA397

O'Keeffe's contribution (1939) to the exhibition catalogue of the show An American place (1944)
1930 - 1950
Source: Georgia O'Keeffe
Context: A flower is relatively small. Everyone has many associations with a flower - the idea of flowers. You put out your hand to touch the flower — lean forward to smell it — maybe touch it with your lips almost without thinking — or give it to someone to please them. Still — in a way — nobody sees a flower — really — it is so small — we haven't time — and to see takes time, like to have a friend takes time... So I said to myself — I'll paint what I see — what the flower is to me but I'll paint it big and they will be surprised into taking time to look at it — I will make even busy New-Yorkers take time to see what I see of flowers... Well — I made you take time to look at what I saw and when you took time to really notice my flower, you hung all your own associations with flowers on my flower and you write about my flower as if I think and see what you think and see of the flower — and I don't.

सुस्तरी श्वास फेर

The Ethics of Belief (1877), The Duty of Inquiry
Context: A bad action is always bad at the time when it is done, no matter what happens afterwards. Every time we let ourselves believe for unworthy reasons, we weaken our powers of self-control, of doubting, of judicially and fairly weighing evidence. We all suffer severely enough from the maintenance and support of false beliefs and the fatally wrong actions which they lead to, and the evil born when one such belief is entertained is great and wide. But a greater and wider evil arises when the credulous character is maintained and supported, when a habit of believing for unworthy reasons is fostered and made permanent. If I steal money from any person, there may be no harm done from the mere transfer of possession; he may not feel the loss, or it may prevent him from using the money badly. But I cannot help doing this great wrong towards Man, that I make myself dishonest. What hurts society is not that it should lose its property, but that it should become a den of thieves, for then it must cease to be society. This is why we ought not to do evil, that good may come; for at any rate this great evil has come, that we have done evil and are made wicked thereby. In like manner, if I let myself believe anything on insufficient evidence, there may be no great harm done by the mere belief; it may be true after all, or I may never have occasion to exhibit it in outward acts. But I cannot help doing this great wrong towards Man, that I make myself credulous. The danger to society is not merely that it should believe wrong things, though that is great enough; but that it should become credulous, and lose the habit of testing things and inquiring into them; for then it must sink back into savagery.

Dark Poet (1991)

Source: When Day is Done (1921), No Room for Hate, stanzas 1 and 2

Lyra's Oxford (2003)
Context: All these tattered old bits and pieces have a history and a meaning. A group of them together can seem like the traces left by an ionizing particle in a bubble chamber: they draw the line of a path taken by something too mysterious to see. That path is a story, of course. What scientists do when they look at the line of bubbles on the screen is work out the story of the particle that made them: what sort of particle it must have been, and what caused it to move in that way, and how long it was likely to continue.
Dr. Mary Malone would have been familiar with that sort of story in the course of her search for dark matter. But it might not have occurred to her, for example, when she sent a postcard to an old friend shortly after arriving in Oxford for the first time, that that card itself would trace part of a story that hadn't yet happened when she wrote it. Perhaps some particles move backward in time; perhaps the future affects the past in some way we don't understand; or perhaps the universe is simply more aware than we are. There are many things we haven't yet learned how to read.
The story in this book is partly about that very process.