There are two types of courage involved with what I did. When it comes to picking up a rifle, millions of people are capable of doing that, as we see in Iraq or Vietnam. But when it comes to risking their careers, or risking being invited to lunch by the establishment, it turns out that's remarkably rare.
Daniel EllsbergRelated topics
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I shall not today attempt further to define the kinds of material I understand to be embraced within that shorthand description [hard-core pornography]; and perhaps I could never succeed in intelligibly doing so. But I know it when I see it, and the motion picture involved in this case is not that.
Potter Stewart
In speaking of the work of machines and of natural forces we must, of course, in this comparison eliminate anything in which activity of intelligence comes into play. The latter is also capable of the hard and intense work of thinking, which tries a man just as muscular exertion does.
Hermann von Helmholtz
Had we lived, I should have had a tale to tell of the hardihood, endurance, and courage of my companions which would have stirred the heart of every Englishman. These rough notes and our dead bodies must tell the tale, but surely, surely, a great rich country like ours will see that those who are dependent on us are properly provided for.
Robert Falcon Scott