Since the spiritual person
has the Spirit of God, he is the opposite of the natural person.
He judges (or investigates) all things, by which is meant all things of the Spirit, those things that are related to God’s wisdom in Christ.
To say that the spiritual person is to be judged by no one
is not to say that a believer should never be criticized or rebuked. It means that a person who does not have the Spirit cannot understand the mind and heart of a person who has the Spirit. The natural person is in no position to criticize the spiritual person’s wisdom, as this wisdom comes from the Spirit.
15 The spiritual person judges all things, but is himself to be judged by no one.