Your question about personality types and the importance of expressing feelings and emotions is one that numerous authors have spent entire books trying to answer. While this is a huge subject, we will try to distill some of the concepts involved with biblical principles for you to consider.
From your use of the term "phlegmatic," it seems that you already understand that people have different personalities or temperaments. One of the older methods of classification describes people as being sanguine, choleric, phlegmatic or melancholy.
In recent years, there have been many newer classification models offered by various individuals, almost all of them based on four descriptions of personality types. One of the most obvious areas of personality identification considers whether a person is generally quiet in contrast to being more expressive. In the Myers-Briggs personality type indicator system, the one most heavily researched and used in the United States, this contrast is referred to as being an extrovert or an introvert.
According to Myers-Briggs data representing hundreds of thousands of people, the U.S. population reflects about 2/3 extroverts to 1/3 introverts. That is one reason the U.S. culture values extroversion (expressing oneself) over introversion (keeping one's thoughts inside). Other cultures, such as those in Asia, value introversion and find extroverted Americans to be overly demonstrative and too talkative. Theoretically, as we mature, we become more comfortable going beyond our preferences (acting more extroverted even if we are introverted, for example). Yet in times of stress, we all tend to revert to our innate preferences.
While there are three other areas of personality identification, let's now focus on your specific question regarding extroversion/introversion—whether as a Christian you should express yourself or remain quiet. The BibleThe books (Greek, "biblia" ) that are acknowledged as canonical (authoritative) by the early Christian Church. It includes both the books of the ancient Hebrew prophets and those of the apostolic witnesses to Jesus Christ. has much to say about communication, because according to our words, we will either be justified or condemned (Matthew 12:37For by thy words thou shalt be justified, and by thy words thou shalt be condemned.
See All...). The reason for this basis of judgment is that we all tend to speak what we think (Matthew 12:34O generation of vipers, how can ye, being evil, speak good things? for out of the abundance of the heart the mouth speaketh.
See All...; Luke 6:45A good man out of the good treasure of his heart bringeth forth that which is good; and an evil man out of the evil treasure of his heart bringeth forth that which is evil: for of the abundance of the heart his mouth speaketh.
See All...). What we are thinking is, thus, the real issue.
Being an extrovert can be either good or bad depending upon what we are thinking. Proverbs 10:19In the multitude of words there wanteth not sin: but he that refraineth his lips is wise.
See All... (NIV) says, "When words are many, sin is not absent, but he who holds his tongue is wise." Ecclesiastes 5:3-7 [3] For a dream cometh through the multitude of business; and a fool's voice is known by multitude of words.
[4] When thou vowest a vow unto God, defer not to pay it; for he hath no pleasure in fools: pay that which thou hast vowed.
[5] Better is it that thou shouldest not vow, than that thou shouldest vow and not pay.
[6] Suffer not thy mouth to cause thy flesh to sin; neither say thou before the angel, that it was an error: wherefore should God be angry at thy voice, and destroy the work of thine hands?
[7] For in the multitude of dreams and many words there are also divers vanities: but fear thou God.
See All... says "many words are meaningless" when there is a wrong orientation. Christ likewise said, "And when you pray, do not keep on babbling like pagans, for they think they will be heard because of their many words" (Matthew 6:7But when ye pray, use not vain repetitions, as the heathen do: for they think that they shall be heard for their much speaking.
See All..., NIV).
In contrast to these scriptures, expressing "many words" of God's truth is good (Acts 2:40And with many other words did he testify and exhort, saying, Save yourselves from this untoward generation.
See All...; 15:32). Likewise, we are told to encourage each other with God's truth (1 Thessalonians 4:18Wherefore comfort one another with these words.
See All...; 5:11). Hebrews 3:13But exhort one another daily, while it is called To day; lest any of you be hardened through the deceitfulness of sin.
See All... speaks of encouraging "one another daily." Peter tells us to be ready to give an answer to anyone who asks us about God's truth (1 Peter 3:15But sanctify the Lord God in your hearts: and be ready always to give an answer to every man that asketh you a reason of the hope that is in you with meekness and fear:
See All...).
In considering these passages, the lesson for us is that personality type is never an excuse to sin, nor is one personality type better than another. God expects all of us to act like Christians regardless of our temperament. If we are extroverts, we would do well to make sure what we are saying is godly. If we are introverts, we need to make sure that we don't neglect encouraging others through our words.
As for how much of our personal feelings and emotions we share with others, each of us makes this decision based upon our personality type and our relation to the individual involved. If the person is our parent, the Fifth Commandment tells us to honor our parents and, thus, we should strive to share our feelings with them. Likewise, husbands, out of love for their wives, should share their feelings with them to build trust. We may also choose to self-disclose our innermost thoughts to a close friend. On the other hand, we are not obligated as Christians to share our innermost thoughts and feelings with strangers or simply anyone who asks.
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