A.T. Robertson Commentary Mark 8:35

"For whosoever would save his life shall lose it; and whosoever shall lose his life for my sake and the gospel`s shall save it." — Mark 8:35 (ASV)

And the gospel's sake (κα του ευαγγελιου). In Mark alone. See on Mt 16:25f. for this paradox. Two senses of "life" and "save." For the last "save" (σωσε)Matthew 16:25 has "find" (ευρησε). See on Mt 16:26 for "gain," "profit," and "exchange."