A mother, for the sake of seeing her child who is studying or serving in a remote and distant location, will travel and suffer through hardships such as extreme weather conditions to do so.  However, when it comes to the time of departure and separation, she will say to herself that “I could bear all the hardships to see my child, but I cannot bear the hardship of our separation…”

Imam Ali peace be upon him, said in Duaa Kumail

صَبَرْتُ عَلَى عَذَابِكَ، فَكَيْفَ أَصْبِرُ عَلَى فِرَاقِكَ

(Suppose that…) I am able to endure Your chastisement; how can I endure separation from You?([1])

[1] translation  http://www.duas.org/kumayl.htm