Allah (c.c.) will sow love of him in the hearts of all people.
Al-Qawl al-mukhtasar fi alamat al-Mahdi al-muntazar, 42
There will remain no individual not pleased with the Ummat al Muhammad.
Signs of the Judgment Day, 163
Mahdi appears, everyone only talks about Him, drinks the love of Him, and never talks about anything other than Him.
Al-Burhan fi Alamat al-Mahdi Akhir al-Zaman, 33
The dwellers of Heaven and Earth, even the birds in the sky, will be pleased with his caliphate.
Al-Qawl al-mukhtasar fi alamat al-Mahdi al-muntazar, 29