(Tit 1:10) For there are many unruly and vain talkers and deceivers, specially they of the circumcision: (11) Whose mouths must be stopped, who subvert whole houses, teaching things which they ought not, for filthy lucre’s sake.” “Whose mouths must be stopped”: doctrine does matter. The souls of people are at stake. The glory of God and meaning to the sacrifice of His Son are at stake. We are to care enough to stand on God’s Word verbally against false doctrine.