Jamieson, Fausset and Brown on Romans 8:6

6. For--a mere particle of transition here [Tholuck], like "but" or "now."

to be carnally minded--literally, "the mind" or "minding of the flesh" (Margin); that is, the pursuit of fleshly ends.

is death--not only "ends in" [Alford, &c.], but even now "is"; carrying death into its bosom, so that such are "dead while they live" (1Ti 5:6; Ep 2:1, 5) [Philippi].

but to be spiritually minded--"the mind" or "minding of the spirit"; that is, the pursuit of spiritual objects.

is life and peace--not "life" only, in contrast with the "death" that is in the other pursuit, but "peace"; it is the very element of the soul's deepest repose and true bliss.