Is the greatest sorrow in the human world having wealth but losing life?
No.
Is it leaving behind a vast fortune when life ends?
That's not it either.
The greatest sorrow is knowing where the mountain of gold is, yet being powerless to alter fate, repeatedly falling into slumber, enduring the agony, and keeping the desire to seize it suppressed in one's heart.
God Danbala of Fudo was such a being, cursed due to betrayal, stripped of his physical body, leaving only his soul. Only the Crystal Tree Core buried beneath Jerusalem could reconstruct his body and free him from his pain.
For tens of thousands of years, Danbala was certainly the most qualified Guardian of Jerusalem, also its most devout follower. He thought constantly of returning to the Holy Land. But what happened?
He sided with the Golden Gods, who did not trust him and were on guard at every turn.