„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, 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? Query 3
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Isaac Newton4
philosophe, mathématicien, physicien, alchimiste, astronome… 1643 - 1727
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But I by backward steps would move.“

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

—  Maria Montessori Italian pedagogue, philosopher and physician 1870 - 1952
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. 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.

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

—  Leonardo Da Vinci Italian Renaissance polymath 1452 - 1519
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.

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