“Are not the Rays of Light in passing by the edges and sides of Bodies, bent several times backwards and forwards, with a motion like that of an Eel?”

— Isaac Newton , book Opticks, or a Treatise of the Reflections, Refractions, Inflections and Colours of Light

Query 3
Opticks (1704)
Context: Are not the Rays of Light in passing by the edges and sides of Bodies, bent several times backwards and forwards, with a motion like that of an Eel? And do not the three Fringes of colour'd Light... arise from three such bendings?

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Isaac Newton 171

British physicist and mathematician and founder of modern c… 1643–1727

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“Doth not this Æthereal Medium in passing out of Water, Glass, Crystal, and other compact and dense Bodies into empty Spaces, grow denser and denser by degrees, and by that means refract the Rays of Light not in a point, but by bending them gradually in curve Lines? And doth not the gradual condensation of this Medium extend to some distance from the Bodies, and thereby cause the Inflexions of the Rays of Light, which pass by the edges of dense Bodies, at some distance from the Bodies?”

Isaac Newton book Opticks, or a Treatise of the Reflections, Refractions, Inflections and Colours of Light

Query 20
Opticks (1704)

“Some men a forward motion love,
But I by backward steps would move.”

Henry Vaughan (1621–1695) Welsh author, physician and metaphysical poet

"The Retreat," l. 29.
Silex Scintillans (1655)

“This is our mission: to cast a ray of light and pass on.”

Maria Montessori (1870–1952) Italian pedagogue, philosopher and physician

Source: The Discovery of the Child (1948), Ch. 8 : The Exercises, p. 141
Variant translation:
This then is the first duty of an educator: to stir up life but leave it free to develop.
Context: This is our mission: to cast a ray of light and pass on. I compare the effects of these first lessons the impressions of a solitary wanderer who is walking serene and happy in a shady grove, meditating; that is leaving his inner thought free to wander. Suddenly a church bell pealing out nearby recalls to himself; then he feels more keenly that peaceful bliss which had already been born, though dormant, within him.
To stimulate life, leaving it free, however, to unfold itself, that is the first duty of the educator.
For such a delicate mission great art is required to suggest the right moment and to limit intervention, last one should disturb or lead astray rather than help the soul which is coming to life and which will live by virtue of it's own efforts.
This art must accompany the scientific method, because the simplicity of our lessons bears a great resemblance to experiments in experimental psychology.

“Talking to you is like -- like talking to an eel!"

"No, is it? I've never tried to talk to an eel. Isn't it as waste of time?"

"Not such a waste of time as talking to you!”

Georgette Heyer book Black Sheep

Source: Black Sheep

“And so, supposing that light impinging on a refracting or reflecting ethereal superficies puts it into a vibrating motion, that physical superficies being by the perpetual applause of rays always kept in a vibrating motion, and the ether therein continually expanded and compressed by turns, if a ray of light impinge on it when it is much compressed, I suppose it is then too dense and stiff to let the ray through, and so reflects it; but the rays that impinge on it at other times, when it is either expanded by the interval between two vibrations or not too much compressed and condensed, go through and are refracted.”

Isaac Newton (1643–1727) British physicist and mathematician and founder of modern classical physics

"Hypothesis explaining the Properties of Light" (1675)

“Life is like that. You live it forward but understand it backward.”

Abraham Verghese book Cutting for Stone

Variant: You live it forward, but understand it backward.
Source: Cutting for Stone

“Shadow is not the absence of light, merely the obstruction of the luminous rays by an opaque body.”

Leonardo Da Vinci (1452–1519) Italian Renaissance polymath

The Notebooks of Leonardo da Vinci (1883), III Six books on Light and Shade
Context: Shadow is not the absence of light, merely the obstruction of the luminous rays by an opaque body. Shadow is of the nature of darkness. Light is of the nature of a luminous body; one conceals and the other reveals. They are always associated and inseparable from all objects. But shadow is a more powerful agent than light, for it can impede and entirely deprive bodies of their light, while light can never entirely expel shadow from a body, that is from an opaque body.