He will also make you stand firm [in the faith] to the end [of your lives], so that you will be [considered] without just blame on the day when our Lord Jesus Christ [returns].

Now the natural person [Note: Since this person is contrasted with the spiritual person of verse 15, it is taken here to mean the person without the Holy Spirit] does not receive the things [i.e., truths] revealed by the Holy Spirit of God, because they are [considered] foolishness to him. And he cannot understand them because they must be discerned by using spiritual judgment [i.e., judgment aided by the Holy Spirit].

For the unbelieving husband is set apart [i.e., as an acceptable mate, although not yet saved. See verse 16], through his wife [i.e., her Christian commitment is viewed as having a godly effect on the home], and the unbelieving wife is set apart through the brother [i.e., for the same reason]. Otherwise, your children would be [considered] unclean. [Note: "Unclean" suggests they would be viewed as pagans were it not for one parent being a Christian]. But, as it is, they are set apart as acceptable [i.e., to God, because of the influence of the one Christian parent].