Light is electromagnetic radiation with a wavelength that is visible to the eye (visible light) or, in a technical or scientific context, the word is sometimes used to mean electromagnetic radiation of all wavelengths. The elementary particle that defines light is the photon.
The sensory perception of light plays a central role in spirituality, and the presence of light as opposed to its absence (darkness) is a common Western metaphor of good and evil, knowledge and ignorance, and similar concepts.
- God is the light of the heavens and the earth. The similitude of His light is as a niche wherein is a lamp.The lamp is in a glass.The glass is as it were a shining star. (This lamp is) kindled from a blessed tree, an olive neither of the East nor of the West, whose oil would almost glow forth (of itself) though no fire touched it. Light upon light, God guideth unto His light whome he will.And God speaketh to mankind in allegories,for God is knower of all things.
- Holy Quran 24:35
- And God said: "Let there be light," and there was light.
- Hail, holy light! offspring of heaven first-born.
- John Milton, Paradise Lost, III. 1.
- We should render thanks to God for having produced this temporal light, which is the smile of heaven and joy of the world, spreading it like a cloth of gold over the face of the air and earth, and lighting it as a torch by which we might behold His works.
- Light itself is a great corrective. A thousand wrongs and abuses that are grown in darkness disappear, like owls and bats, before the light of day.
- No wonder that light is so frequently used by the sacred oracles as the symbol of our best blessings. Of the Gospel revelation one apostle says, "The night is far spent, and the day is at hand." Another, under the impression of the same auspicious event, thus applied the language of ancient prophecy: "The people who sat in darkness have seen a great light; and to them which sat in the region and shadow of death light is sprung up."
- The light in the world comes principally from two sources,—the sun, and the student's lamp.
- Enlighten the path of others – darkness lights its own way.
- More light!
- Goethe's dying words