“Do I worship modern medicine? Is science my religion? Not at all; there is no aspect of modern medicine or science that I would exempt from the most rigorous scrutiny, and I can readily identify a host of serious problems that still need to be fixed. That's easy to do, of course, because the worlds of medicine and science are already engaged in the most obsessive, intensive, and humble self-assessments yet known to human institutions, and they regularly make public the results of their self-examinations. Moreover, this open-ended rational criticism, imperfect as it is, is the secret of the astounding success of these human enterprises. There are measurable improvements every day.”

As quoted in Computers in biomedical research (1965) by Ralph W. Stacy, p. 320.

Though sometimes quoted as if he were author of it, the expression "Only those who see the invisible can do the impossible" is one that greatly predates Lown's use of it; it has also been attributed to Thomas Jefferson, Jesus and Mrs. Charles E. Cowman, but the earliest published expression yet located seems to have been one by American Baptist minister Rev. Robert Stuart MacArthur in Royal Messages of Cheer and Comfort Beautifully Told (1909) edited by Sarah Conger Robinson, p. 58
A Prescription for Hope (1985)
Context: We must hold fast to the dream that reason will prevail. The world today is full of anguish and dread. As great as is the danger, still greater is the opportunity. If science and technology have catapulted us to the brink of extinction, the same ingenuity has brought humankind to the boundary of an age of abundance.
Never before was it possible to feed all the hungry. Never before was it possible to shelter all the homeless. Never before was it possible to teach all the illiterates. Never before were we able to heal so many afflictions. For the first time science and medicine can diminish drudgery and pain.
Only those who see the invisible can do the impossible. But in order to do the impossible, in the words of Jonathan Schell, we ask "not for our personal survival: we ask only that we be survived. We ask for assurance that when we die as individuals, as we know we must, mankind will live on".

Source: The Gendered Atom: Reflections on the Sexual Psychology of Science (1999), Ch.11 Only Connect

Thank Goodness! (2006)
Context: Goodness comes in many forms, not just medicine and science. Thank goodness for the music of, say, Randy Newman, which could not exist without all those wonderful pianos and recording studios, to say nothing of the musical contributions of every great composer from Bach through Wagner to Scott Joplin and the Beatles. Thank goodness for fresh drinking water in the tap, and food on our table. Thank goodness for fair elections and truthful journalism. If you want to express your gratitude to goodness, you can plant a tree, feed an orphan, buy books for schoolgirls in the Islamic world, or contribute in thousands of other ways to the manifest improvement of life on this planet now and in the near future.
Or you can thank God — but the very idea of repaying God is ludicrous. What could an omniscient, omnipotent Being (the Man Who has Everything?) do with any paltry repayments from you? (And besides, according to the Christian tradition God has already redeemed the debt for all time, by sacrificing his own son. Try to repay that loan!) Yes, I know, those themes are not to be understood literally; they are symbolic. I grant it, but then the idea that by thanking God you are actually doing some good has got to be understood to be just symbolic, too. I prefer real good to symbolic good.
Still, I excuse those who pray for me. I see them as like tenacious scientists who resist the evidence for theories they don't like long after a graceful concession would have been the appropriate response. I applaud you for your loyalty to your own position — but remember: loyalty to tradition is not enough. You've got to keep asking yourself: What if I'm wrong? In the long run, I think religious people can be asked to live up to the same moral standards as secular people in science and medicine.

Interview with Oriana Fallaci (2 December 1979), Corriere della Sera
Interviews

Medical Nemesis (1976)

"Miracle Drug"
Lyrics, How to Dismantle an Atomic Bomb (2004)