Why do churches have guest speakers or ministers in to preach?


Let's permit the Word of God to reveal the answer to your question:
And He (Jesus) Himself gave some to be apostles, some prophets, some evangelists, and some pastors and teachers, for the equipping of the saints for the work of ministry, for the edifying of the body of Christ, till we all come to the unity of the faith and of the knowledge of the Son of God, to a perfect man, to the measure of the stature of the fullness of Christ;

that we should no longer be children, tossed to and fro and carried about with every wind of doctrine, by the trickery of men, in the cunning craftiness by which they lie in wait to deceive, but, speaking the truth in love, may grow up in all things into Him who is the head - Christ -

from whom the whole body, joined and knit together by what every joint supplies, according to the effective working by which every part does its share, causes growth of the body for the edifying of itself in love.
(Eph. 4:11-16)
According to the above text, it is necessary for a Christian to sit under all five of the five-fold ministry gifts.

This is the only way that a Christian can mature spiritually. This is why it is good for a pastor to bring in guest ministers. They have something to add that the pastor cannot give, and we all need each other.

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