اَلصَّاحِبُ كالرُّقعَةِ فَاتَّخِذْهُ مُشاكِلاً
A friend is like a patch, so choose a matching friend.
كن بعدوك العاقل أوثق منك بصديقك الجاهل
Have more trust in a rational enemy than in a stupid friend.
A sane person doesn’t trust his enemies and is cautious when dealing with them. The Imam says that we have to be even more cautious with our friends if they are stupid. This is because a stupid friend may reveal your secrets, embarrass you, or get you into trouble.
ليس للمتكبر صديق
There is no friend for the arrogant.
صحبة الأشرار تكسب الشر كالريح إذا مرت بالنتن حملت نتنا
Befriending evil people makes you evil, just like the wind: if it passes through a stinking place, it carries a stinking smell.
The Imam means by evil people: people who are morally corrupt, bad and wicked.