إِنَّ الْقُلُوبَ إِذَا تَنَافَرَ وُدُّهَا مِثْلُ الزُّجَاجَةِ كَسْرُهَا لَا يُجْبَرُ
When hearts lose their mutual affection, they resemble glass: once broken, it is not easily restored to its former state.
The speaker depicts the difficulty of repairing estranged affection. The tangible picture of broken glass strengthens an abstract moral warning about damaging relationships.
Purpose: reinforcing the stated condition.