The worst thing that anyone can do, is to ignore learning Bible doctrine by means of instruction in a daily study. Too many people read verses, or make what they think are spiritual comments, but go no further. And consequently, their life goes no further.
There are two spheres, and only two spheres, or environments, in which you can live your life.
The first sphere or environment, is the carnal environment, which we also call being out of fellowsh
ip. In this environment you are controlled by the sin nature.
The second sphere or environment, is called the spiritual environment, which we call being in fellowship. In this environment you are controlled by the Holy Spirit.
Note, that in either sphere you cannot detect or measure or sense or feel the sin nature or the Holy Spirit. These are things that are beyond the human senses.
Each of these environments are mutually exclusive, which means, you are in one or the other, but never both simultaneously.
All unbelievers, live perpetually in the carnal state.
All believers in Christ, can live in either the carnal or the spiritual state. The determining factor is sin. Commit a sin and you shift to the carnal state. Confess the sin and you shift to the spiritual state. We call the shifting, being in fellowship or being out of fellowship.
The carnal state is a state that is outside the will of God, and therefore outside of a functional relationship with God.
The carnal state is where the spiritual life does not function, and is therefore a form of death, which we can call a non-functional spiritual state. Death is a word that can be used to describe no function or no production.
Life, on the other hand is a term that can be used to describe production or function, when one is in fellowship, and therefore has an active relationship with God.
Therefore, when you are out of fellowship, your spiritual life does not function, and produces nothing.
However, when you are in fellowship, you are spiritually minded, meaning influenced by the Holy Spirit and Bible doctrine within your soul, and you are advancing, or in a state where advancement can occur, in your spiritual life, toward the objective of spiritual maturity, which we call peace.