Our Brothers Remind Us of the Hereafter
Al-Hasan al-Basri (may Allah have mercy on him) said:
Our brothers are dearer to us than our families, for our families remind us of this world, but our brothers remind us of the Hereafter.
If this absence goes on for too long, it creates alienation in the heart, which eventually changes into disdain for that faith-filled atmosphere, which in turn hardens the heart and fills it with darkness, extinguishing the light of iman.
This explains the complete change of heart on the part of some who travel to other lands on vacation or who relocate for purposes of work or study.