“ Setting the mind on the spirit ” does not imply that a person has to live with his head in the clouds, so to speak.
لَا يَعْنِي ‹ تَوْجِيهُ ٱلْفِكْرِ إِلَى أُمُورِ ٱلرُّوحِ › أَنْ يَتَخَلَّى ٱلْمَرْءُ تَمَامًا عَنْ أُمُورِ ٱلدُّنْيَا .‏