The problem is, of course, when quotes get used out of context, or with twisted meanings. The one quote that gets pushed into service very frequently with science-writing, and is almost always hideously misued, is That Keats Quote:
The usual meaning the writer is trying to convey with this quote is, "Look at this thing. This thing is beautiful. It must be true!" or occasionally, "Look at how this true thing is beautiful. Poets and scientists both have the same view of how the world is!" Occasionally it's just shortened down to just the first line, or the first few words "Beauty is truth, truth beauty"
Which takes the quote completely out of context and, what's even worse, completely destroys the beautiful subtlety of it. In fact it completely destroys the entire point of the quote in the first place, which is to question the connections between truth, beauty, reality and desire.
The poem the quote is taken from is "Ode on a Grecian urn" which is slightly too long to be reproduced in full, but can be found here and is highly recommended, along with most of Keats. As the title suggests, it's a poem about a Greek pot, more specifically the patterns and pictures around the pot. Examining the frozen scenes (which show a man playing the pipes under a tree, two lovers about to kiss, and a procession of villagers with a calf for sacrifice) allows Keats to return to one of his favourite themes; which is more preferable, a passion that is everlasting but will never reach fulfillment? Or the experience of true and complete fulfillness which must then pass away into decay and death. Basically the Keatsien version of "is it better to have loved and lost or never loved at all?"
The urn represents agelessness, the unchanging and fixed scenes. The lover's cannot kiss and the piper cannot go home, but will be "for ever piping songs, for ever new". In the second and third stanza (paragraph) Keats seems rather wistfully jealous of this state of affairs. The lover's might not be able to reach fulfilment, but they've been locked in their embrace for several hundred times his lifetime. In the forth stanza however, he briefly touches on the downside of changelessness, namely that everything remains unchanged. The villagers will be in continuous procession, but likewise their village will always be empty, for the rest of eternity.
The final stanza, brings it all together, but it ends it with a big question, not an answer. Keats has no more answers than we do as to whether the timeless yet unfulfilled nature of the Grecian urn is preferable or not. All this of course, leads up to the final quote:
|Thou, silent form! dost tease us out of thought|
|As doth eternity: Cold Pastoral!||45|
|When old age shall this generation waste,|
|Thou shalt remain, in midst of other woe|
|Than ours, a friend to man, to whom thou say'st,|
|'Beauty is truth, truth beauty,—that is all|
| Ye know on earth, and all ye need to know.'|
The final quote! Which isn't even said by Keats. It isn't even what the poet thinks, it's a final summery of the point of view of life from the Grecian urn. Keats is still teased out of thought, but he takes some comfort in the fact that the urn will always be there. No matter how crazy or insane life gets, the world of the Grecian urn will always be beautiful, and always be truthful. Not the real world, the real world is changeable, ugly and false, that is why the urn remains a source of comfort. Preferable or not, the "Cold pastoral" of the Grecian urn will by its very nature embody the truth, beauty and permanence that the rest of the world does not.
If those last two lines are a comment about anything, it's the nature of art, rather than the nature of reality. Art, or at the very least things that are pleasant to look at because they make you forget the uglyness of reality (Keats = proto-emo), should be things for which beauty and truth are equal. A piece of work which is both true and beautiful. The definition of truth at this point is another matter entirely, in the case of the Grecian urn my view is that 'true' means 'revealing some deep truth about the world' in this case the struggle between permanence and fulfilment.
Either way, it's certainly not "Keats on the nature of reality". Which is how it's so often used.