Revelation 3:14
Write a scroll letter to the angel of the church in Laodicea. This is the message from the One Who is the Amen- the Faithful and True Witness, the Origin, Beginning, and Author of God's creation.

Revelation 3:15
I know your works -you are neither cold nor hot- I would that you were cold or hot.

Are there other scrolls in the bible that appear to reveal hotness? Yes. Here are a few:

Set me as a seal upon your heart...its flames are flames of fire, a most vehement flame
(Song of Solomon 8:6).

And they said to one another- did not our heart burn within us while He talked with us on the road, and while He opened the Scriptures to us?
(Luke 24:32).

John (the Baptist) answered, saying to all- I indeed baptize you with water- but One mightier than I is coming, whose sandal strap I am not worthy to loose. He will baptize you with the Holy Spirit and fire (Luke 3:16)...When the Day of Pentecost had fully come, they were all with one accord in one place. And suddenly there came a sound from Heaven, as of a rushing mighty wind, and it filled the whole house where they were sitting. And they saw tongues of what looked like fire distributing themselves over the assembly, and on the head of each person a tongue alighted. And they were all filled with the Holy Spirit and began to speak with other tongues, as the Spirit gave them utterance
(Acts 2:1-4).

Be kindly affectionate to one another with brotherly love, in honor giving preference to one another- not lagging in diligence, hot in spirit, serving the Lord- rejoicing in hope, patient in tribulation, continuing steadfastly in prayer- distributing to the needs of the saints, given to hospitality
(Romans 12:10-13).

Some examples of lukewarmness or being in the middle between two extremes-

And Elijah came to all the people, and said- how long will you falter between two opinions? If the Lord is God, follow Him- but if Baal, follow him. But the people answered him not a word
(1 Kings 18:21).

So these nations (that comprised the Samaritans) feared the Lord, yet served their carved idols- also their children and their children's children have continued doing as their fathers did, even to this day
(2 Kings 17:41).

No man can be the bondservant of two masters- for either he will dislike one and like the other, or he will attach himself to one and think slightingly of the other. You cannot be the bondservants both of God and of gold
(Matthew 6:24).

Revelation 3:16
So then, because you are lukewarm, and neither cold nor hot, I will vomit you out of My mouth.

They (the early Samaritans) feared the Lord, yet served their own gods- according to the manner of the nations from among whom they were carried away
(2 Kings 17:33)...and (they) burned their children in fire to Adrammelech and Anammelech, the gods of Sepharvaim...(2 Kings 17:31).
As mentioned before the early Samaritans believed in God, on one hand, while worshipping idols (Satan) with the other hand. They steered a spiritual lukewarm middle of the road course between God and Satan. That did not spiritually fly with the Lord and the devout Hebrews despised the Samaritans for it. It appears some Laodiceans in the church were doing the same thing. They were professing Christ with one hand while holding on to their idol (their material riches and wealth) with their other hand. They were walking down the middle of the road wanting the best of both worlds. However, both worlds are polar opposites. The kingdom of Satan (the evil world system) is opposite to the kingdom of God. Having no spiritual integrity is considered to be spiritually cold. Having great spiritual intensity is considered to be spiritually hot. But being in the middle is considered by the Lord to be lukewarm. It might be better for one to be on one side or the other rather than in the middle.

And He said to them- you are those who justify yourselves before men, but God knows your hearts. For what is highly esteemed among men is an abomination in the sight of God
(Luke 16:15).

These people are as useless as dried-up springs of water or as clouds blown away by the wind- promising much and delivering nothing. They are doomed to blackest darkness. They brag about themselves with empty, foolish boasting. With lustful desire as their bait, they lure back into sin those who have just escaped from such wicked living. They promise freedom, but they themselves are slaves to sin and corruption. For you are a slave to whatever controls you. And when people escape from the wicked ways of the world by learning about our Lord and Savior Jesus Christ and then get tangled up with sin and become its slave again, they are worse off than before. It would be better if they had never known the right way to live than to know it and then reject the holy commandments that were given to them. They make these proverbs come true- a dog returns to its vomit and a washed pig returns to the mud
(2 Peter 2:17-22).

Any individual who chooses to stay in the middle and stay spiritually lukewarm will be vomited out of the Lord's life. That was very strong chastisement for the folks in the church at Laodicea then and a strong message to any individual today who chooses to be that way and to stay that way.