Allah is the Light of the heavens and the earth.The parable of His Light is a niche wherein is a lamp the lamp is in a glass,the glass as it were a glittering starlit from a blessed olive tree,neither eastern nor western,whose oil almost lights up, though fire should not touch it
﴿ وَلَوْ كُنتَ فَظًّا غَلِيظَ الْقَلْبِ لَانفَضُّوا مِنْ حَوْلِكَ ﴾
And if you had been rude [in speech] and harsh in heart, they would have disbanded from about you.