I think the simplest answer for this question is "satisfaction." It is really hard to achieve it, though.
Rahim says: "Gau-Dhan, Gaj-Dhan, Gopi-Dhan, Ratan-Dhan-Khan, Jahan Avey Santosh-Dhan Sab Dhan Dhool Sama".
Translation: There are various kinds of wealth: cattle, elephants, women, jewels, but, once you get wealth of satisfaction, all other wealth is like dust.
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