Five warning are provided in the given scriptures that are conveying the heart of God to not fall into their influence: (1) Being Stuck Half-way, (2) Laziness, (3) Complacency, (4) Captiousness (or perhaps Carping might be more fitting), and (5) Lukewarmness.
Matthew 12:43-45; Matthew 25:24-26; Zephaniah 1:12; Luke 7:32; Revelation 3:15,16