وَقَالَ (عليه السلام):
Amir al-mu'minin, peace be upon him, said:
الْفِكْرُ مرْآةٌ صَافِيَةٌ،
Imagination is a clear mirror,
وَالاْعْتِبَارُ مُنْذِرٌ نَاصِحٌ،
and the taking of lessons (from things around) provides warning and counsel.
وَكَفى أَدَباً لِنَفْسِكَ تَجَنُّبُكَ مَا كَرِهْتَهُ لِغَيْرِكَ.
It is enough for improving yourself that you should avoid what you consider bad in others.