أَلَمْ تَرَ كَيْفَ ضَرَبَ اللّهُ مَثَلاً كَلِمَةً طَيِّبَةً كَشَجَرةٍ طَيِّبَةٍ أَصْلُهَا ثَابِتٌ وَفَرْعُهَا فِي السَّمَاء تُؤْتِي أُكُلَهَا كُلَّ حِينٍ بِإِذْنِ رَبِّهَا وَيَضْرِبُ اللّهُ الأَمْثَالَ لِلنَّاسِ لَعَلَّهُمْ يَتَذَكَّرُونَ وَمَثلُ كَلِمَةٍ خَبِيثَةٍ كَشَجَرَةٍ خَبِيثَةٍ اجْتُثَّتْ مِن فَوْقِ الأَرْضِ مَا لَهَا مِن قَرَارٍ – إبراهيم 24–26
Have you considered how God describes a good word like a good tree that is firmly grounded and its trunk rises high into the sky. It bears fruit all the time that people benefit from. And it begets more of its kind. It begets goodness.
As for evil, or a foul word, it is like a sick tree that is barely rooted. It does not bear fruit, nor does it give life. It does not survive.
Why should we consume ourselves with a sick tree! Why not plant a good word. Why not light a candle that we must light.