This is only one instance, but there are thousands of instances which show that the friendship formed in. God and truth between the teacher and the disciple is for always, and that nothing in the world is able to break it. If the spiritual link cannot hold, how can a material link keep intact? It will wear out, being only a worldly link. If spiritual thought cannot form a link between two souls, what else can constitute such a strong tie that it can last both here and in the hereafter?