Titus 1:15

Unto the pure [τ ο ι ς κ α θ α ρ ο ι ς]. The pure in heart and conscience. See 2 Timothy 1:3.

All things are pure. Comp. 1 Timothy 4:4; 1 Timothy 4:5; Acts 10:15; Mark 7:15; Mark 7:18; Mark 7:19; 1 Corinthians 10:26; 1 Corinthians 10:30; Romans 14:20. The aphorism is suggested by the commandments of men, verse 14.

Unto them that are defiled [τ ο ι ς μ ε μ ι α μ μ ε ν ο ι ς]. Only here in Pastorals. See also John 18:28 (note); Hebrews 12:15; Jude 1:8. Only in John 18:28 in a ceremonial sense. Elsewhere of moral pollution. Nothing is pure. Their moral pollution taints everything with its own quality. The purest things become suggestors and ministers of impurity. Mind and conscience [ο ν ο υ ς κ α ι η σ υ ν ε ι δ η σ ι ς]. For nouv see On Romans 7:23 : for suneidhsiv, on 1 Peter 3:16.