Jesus is telling them that the things of earth are not worth losing ones` soul over.
Note that He is talking about our mind, will and emotions (soul).
He is talking about sacrificing our eternal being for a brief time on earth.
AbundantLife is only experienced through denying the OldMan and living as the NewSpirit being that you are InChrist.
EternalLife is in relationship with Christ through the NewSpirit being.
EternalLife is a gift.