Reference to the meaning neutral
What is living in neutral? Living in neutral meaning that you are in middle and can roll ether way, forward or backward, and another reference analogy is a neutral color.
A lukewarm life displeasing to God; he would have us to be fervent in spirit. God is pleased with us when we are lively stones, but not when we are formal and lukewarm. A lukewarm state is a dangerous state. Romans 12:11 Not slothful in business; fervent in spirit; serving the Lord;
First. A kind of doubtful or uncertain feeling as to whether you are right with God, together with an unwillingness to examine yourself closely for fear you are wanting. Being filled with the Spirit gives us fullness of assurance.