“How long halt ye between two opinions? If the Lord be God, follow Him” (1 Kings 18:21).
“Their heart is divided; now shall they be found faulty” (Hosea 10:2).
“Where your treasure is, there will your heart be also … no man can serve two masters” (Matthew 6:21,24).
“Know ye not that the friendship of the world is enmity with God?” (James 4:4).
“Because thou art lukewarm, and neither cold nor hot, I will spue thee out of My mouth” (Revelation 3:16).