I feel that there is much to be said for the Celtic belief that the souls of those whom we have lost are held captive in some inferior being, in an animal, in a plant, in some inanimate object, and so effectively lost to us until the day (which to many never comes) when we happen to pass by the tree or to obtain possession of the object which forms their prison.
Oso sinesgarria iruditzen zait sinesmen zeltiko hori, zera ohi dioena, galdu ditugunen arimak gatibu gelditzen direla, alegia, maila beheragoko izaki batean edo batengan, dela piztia, dela landare, dela gauza bizigabe, galdurik, zinez, guretzat, harik eta, egun batez, egun hori zenbaitentzat inoiz iristen ez bada ere, zuhaitz horren paretik igarotzea edo gureen espetxe den objektuaz jabetzea suertatzen zaigun arte. Orduan asaldatu egiten omen dira, hots egiten omen digute, eta guk haiek berrezagutu ordukoxe, orduantxe aienatzen ei da liluramendua.