Do not accompany anyone but the intelligent and pious; and do not associate with anyone but the knowledgeable and righteous; and do not mention your secret to anyone but the trustworthy and loyal
Be careful not to drive away your friend in a way that removes all the affection he has for you, and leave some room from your friendship for him so that he may rely on returning back to it
If you want to cut off ties with your brother [in faith] then leave some of your friendship for him, so that he may return to it someday if he so wishes
[Even] if you have gained confidence and trust in your close friend, safeguard some of your affairs and conceal some of your secrets [from him], for it is possible that you may regret [revealing them] at some time [in the future]
المصدر : غرر الحكم ودرر الكلم
إِذَا أَحْبَبْتَ فَلَا تُكْثِرْ
When you love [something or someone] then do not be excessive [in your love]
Keep away from harbouring grudges against each other, hating each other, quarrelling with one other and not lending a supporting hand to each other, [and by doing this] you will gain mastery over your affairs
Do not declare your enmity to your enemy and do not rebuke your friend; and accept the excuse [you are given] even if it is a lie, and do not give [a forceful] response despite having the power to do so, even if it be your right
Do not frequent the company of a wicked person, for if you are bestowed with a blessing, he will envy you and if a misfortune befalls you, he will abandon you