This single verse is a parable: Allah's guidance is compared to a lamp inside a glass, lit from a blessed tree, 'light upon light'. Scholars have written whole books on it. Read it slowly, more than once.
An-Nur 24:35
Listen on Quran.com۞ ٱللَّهُ نُورُ ٱلسَّمَـٰوَٰتِ وَٱلْأَرْضِ ۚ مَثَلُ نُورِهِۦ كَمِشْكَوٰةٍ فِيهَا مِصْبَاحٌ ۖ ٱلْمِصْبَاحُ فِى زُجَاجَةٍ ۖ ٱلزُّجَاجَةُ كَأَنَّهَا كَوْكَبٌ دُرِّىٌّ يُوقَدُ مِن شَجَرَةٍ مُّبَـٰرَكَةٍ زَيْتُونَةٍ لَّا شَرْقِيَّةٍ وَلَا غَرْبِيَّةٍ يَكَادُ زَيْتُهَا يُضِىٓءُ وَلَوْ لَمْ تَمْسَسْهُ نَارٌ ۚ نُّورٌ عَلَىٰ نُورٍ ۗ يَهْدِى ٱللَّهُ لِنُورِهِۦ مَن يَشَآءُ ۚ وَيَضْرِبُ ٱللَّهُ ٱلْأَمْثَـٰلَ لِلنَّاسِ ۗ وَٱللَّهُ بِكُلِّ شَىْءٍ عَلِيمٌ
24:35Allah is the Light of the heavens and the earth. The example of His light is that of a niche, in which there is a lamp; the lamp is in a glass - the glass looks like a brilliant star - it is lit by (the oil of) a blessed tree, the olive, which is neither eastern, nor western. Its oil is about to emit light even though the fire has not touched it - (it is) light upon light. Allah guides to His light whomsoever He wills; Allah describes examples for the people, and Allah knows everything well.
English translation: Mufti Muhammad Taqi Usmani, The Meanings of the Noble Qur'an, via Quran.com. Arabic: Uthmani script.
When has something suddenly made sense to you, like a light coming on?