Note that both words are in the past (aorist) tense: “if he may have gained or lost. The Lord looks back to the details of each life as the factors of the final sum of gain or loss. For lose, Rev. gives forfeit. The verb in the active voice means to cause loss or damage. Often in the classics, of fining or mulcting in a sum of money. Compare 2Co 7:9.
Soul (ψυχὴν)
Rev., life, with soul in margin. This will be specially considered in the discussion of the psychological terms in the Epistles.