أحْسِنِ الظَّنَ بِاللّٰهِ فَإنَّ مَنْ حَسَّنَ ظَنَّهُ بِاللّٰهِ کانَ اللّٰهُ عِنْدَ ظَنِّهِ Have a good opinion of Allah, for whoever has a good opinion of Allah He will treat him in the same way.
Tuhaf al-Uqul, page 472
Imam Ali ibn Musa al-Rida (peace be upon him)Hadith