“Astronomers have built telescopes which can show myriads of stars unseen before; but when a man looks through a tear in his own eye, that is a lens which opens reaches in the unknown, and reveals orbs which no telescope, however skilfully constructed, could do; nay, which brings to view even the throne of God, and pierces the nebulous distance where are those eternal verities in which true life consists.”

Source: Saturn and its System (2nd ed 1882), Chapter 1, p. 2

Proverbs from Plymouth Pulpit (1887)

The Circle of Memory, An Autobiography (2016)

Source: The Great Divorce (1944–1945), Ch. 13
Context: "Ye can know nothing of the end of all things, or nothing expressible in those terms. It may be, as the Lord said to the Lady Julian, that all will be well, and all will be well, and all manner of things will be well. But it's ill talking of such questions."
"Because they are too terrible, Sir?"
"No. Because all answers deceive. If ye put the question from within Time and are asking about possibilities, the answer is certain. The choice of ways is before you. Neither is closed. Any man may choose eternal death. Those who choose it will have it. But if ye are trying to leap on into Eternity, if ye are trying to see the final state of all things as it will be (for so ye must speak) when there are no more possibilities left but only the Real, then ye ask what cannot be answered to mortal ears. Time is the very lens through which ye see — small and clear, as men see through the wrong end of a telescope — something that would otherwise be too big for ye to see at all. That thing is Freedom: the gift whereby ye most resemble your Maker and are yourselves parts of eternal reality. But ye can see it only through the lens of Time, in a little clear picture, through the inverted telescope. It is a picture of moments following one another and yourself in each moment making some choice that might have been otherwise. Neither the temporal succession nor the phantom of what ye might have chosen and didn't is itself Freedom. They are a lens. The picture is a symbol: but it's truer than any philosophical theorem (or, perhaps, than any mystic's vision) that claims to go behind it. For every attempt to see the shape of eternity except through the lens of Time destroys your knowledge of Freedom."

Prismatic and Diffraction Spectra: Memoirs (1899) Tr. & Ed. J. S. Ames p. 14-15

The Diary of Samuel Marchbanks (1947)
Context: But I wonder if people do not attach too much importance to the first-name habit? Every man and woman is a mystery, built like those Chinese puzzles which consist of one box inside another, so that ten or twelve boxes have to be opened before the final solution is found. Not more than two or three people have ever penetrated beyond my outside box, and there are not many people whom I have explored further; if anyone imagines that being on first-name terms with somebody magically strips away all the boxes and reveals the inner treasure he still has a great deal to learn about human nature. There are people, of course, who consist only of one box, and that a cardboard carton, containing nothing at all.

Laplace, p. 347.
Biographies of Distinguished Scientific Men (1859)

Book IV, Ch. 1, as quoted in "Kepler's Astrology"in Kepler, Four Hundred Years (1975) edited by Arthur and Peter Beer.
Harmonices Mundi (1618)