It is reported that ‘Umar b. ‘Abd Al-‘Azîz once wrote to Al-Hasan Al-Basrî to get a brief exhortation from him, so Al-Hasan wrote back ,
The dunyâ distracts and preoccupies the heart and body, but al-zuhd (asceticism, not giving importance to worldly things) gives rest to the heart and body. Verily, Allâh will ask us about the halâl things we enjoyed, so what about the harâm!
Al-Bayhaqî, Al-Zuhd Al-Kabîr, article 26.