Material attachment: he is very much attached to the child, but he does not know this will break; this attachment will not endure. When the child is grown up, neither the father will have so much attachment, nor the child will have so much. This is called material world. But the same attachment is there in the spiritual world. Just like Mother Yasoda, Maharaja Nanda, he is attached to Krsna. They are also enjoying the same way, but that enjoyment is never broken. That is the difference. This attachment between father and son or mother and son in this material world, it will not stay. It will break, today or tomorrow. That is the nature.

From Srila Prabhupada's lecture on Srimad-Bhagavatam 6.1.25 — July 9, 1975, Chicago