Detachment

Detachment does not consist in setting fire to one’s house, or becoming bankrupt or throwing one’s fortune out of the window, or even giving away all of one’s possessions. Detachment consists in refraining from letting our possessions possess us.
  A prosperous merchant who is not absorbed in his business knows severance.
A banker whose occupation does not prevent him from serving humanity is severed.
A poor man can be attached to a small thing.

(‘Abdu’l-Bahá, Divine Philosophy, p. 135-136)