You must be in fellowship prior to your Bible study, so that the spiritual information you receive can become a source, of blessing to your soul and produce spiritual growth.
32 And[de] be[ginomai] ye kind[chrestos] one to
another[eis],[allelon] tenderhearted,[eusplagchnos] forgiving[charizomai] one another,[heautou] even as[kathos][kai] God[theos] for[en] Christ's[Christos] sake[en] hath forgiven[charizomai]
you.[humin] KJV-Interlinear
32 And be
kind to one another, tender-hearted, forgiving each other, just as God in
Christ also has forgiven you. NASB
When you pursue a legitimate Christian life, which is to say that you engage in a daily bible study, confess your sins regularly, learn, gain understanding from that learning, and grow up in your spiritual life, then your whole outlook on life, your whole demeanor, your whole attitude toward God, people, self and life as a whole, will change accordingly.
Good behavior is not the spiritual life. Legitimate good behavior is a result of a functional spiritual life.
Anyone can have good manners, but that does not make them Godly.
The difference between a polite unspiritual person and a polite spiritual person, is that the spiritual person's manners are genuine and without ulterior motives.
By definition, the unspiritual persons behavior is a product of their carnal nature, which is a product of evil regardless of its source. A carnal person is one who functions outside of Gods defined sphere of fellowship. And that source is the sin nature, something that we are to all leave behind us and replace with a spiritual nature.
Unspiritual includes all unbelievers and all out of fellowship believers. So anyone can be polite, but only believers in fellowship can be legitimately polite.
The specific politeness stated here, kind, tenderhearted, forgiving and so forth, all place life in its proper perspective. We know that life is unfair in this devils world, that not all people are equal, that not all people have the good life, and many have very difficult lives. And regardless if their bad luck is of their own doing, we still need to be empathetic toward all and not contribute negativity to their outlook on life that might lead to further resentment, or bitterness in them.
It is better to place hope or something positive in front of others rather than anything that will keep them sour on life and away from God.
A bitter person seeks to find blame in others or in anything, but one who receives kindness may change if only a little bit, and that can eventually open up the spiritual door to a massive and positive change in their life.
It is far better to give to others a foundation, doctrine, upon which they can set their life, and opportunities, spiritual promise, upon which they can enjoy it.