I don’t know if this is brought down in a sefer, but R’ Kirzner Z”L discusses it in his Golus tape.
If someone doesn’t value something that he has, and it is taken away from him, he will value that object more and want it back.
Hashem put this law into our nature and thus conducts Himself with us according to it.
When we didn’t value spirituality, we were exiled/ Hester Ponim, so that we should once again recognize its value and beg for it.
When we regain our appreciation for what we once had, and show Hashem that we want it back wholeheartedly, He will rebuild the Beis Hamikdosh (bimheira biyomeinu, amen. <end speech>)