Warnings about being lukewarm

“I know your works: you are neither cold nor hot. Would that you were either cold or hot! So, because you are lukewarm, and neither hot nor cold, I will spit you out of my mouth.” (Rev. 3:15-16 ESV)

People will not endure sound teaching

“For the time is coming when people will not endure sound teaching, but having itching ears they will accumulate for themselves teachers to suit their own passions.” (2 Tim. 4:3 ESV)

Some will depart from the faith

“Now the Spirit expressly says that in later times some will depart from the faith by devoting themselves to deceitful spirits and teachings of demons.” (1Tim. 4:1 ESV)

Thoughts led astray

“But I am afraid that as the serpent deceived Eve by his cunning, your thoughts will be led astray from a sincere and pure devotion to Christ.” (2 Cor. 11:3 ESV)

If you lose your saltiness

“You are the salt of the earth, but if salt has lost its taste, how shall its saltiness be restored? It is no longer good for anything except to be thrown out and trampled under people's feet.” (Matt. 5:13 ESV)

Loving the world and things

“Do not love the world or the things in the world. If anyone loves the world, the love of the Father is not in him. For all that is in the world—the desires of the flesh and the desires of the eyes and pride in possessions—is not from the Father but is from the world.” (1John 2:15-16 ESV)

“For what will it profit a man if he gains the whole world and forfeits his soul? Or what shall a man give in return for his soul?” (Matt. 16:23 ESV)

Therefore…

“Examine yourselves, to see whether you are in the faith. Test yourselves. Or do you not realize this about yourselves, that Jesus Christ is in you?—unless indeed you fail to meet the test!” (2 Cor. 13:5 ESV)