al-'Ala' bin 'Abdul Jabbar العلاء بن عبد الجبار العطار · The Book of Repentance

If a believer were to know the punishment (in Hell) none would have the audacity to aspire for Paradise (but he would earnestly desire to be rescued from Hell), and if a non-believer were to know what is there with Allah as a mercy. none would have been disappointed in regard to Paradise.