Passage
All things are clean to the clean: but to them that are defiled and to unbelievers, nothing is clean: but both their mind and their conscience are defiled.
All things are clean to the clean: but to them that are defiled and to unbelievers, nothing is clean: but both their mind and their conscience are defiled.
Titus 1:13 This testimony is true. Wherefore, rebuke them sharply, that they may be sound in the faith:
Titus 1:14 Not giving heed to Jewish fables and commandments of men who turn themselves away from the truth.
Titus 1:15 All things are clean to the clean: but to them that are defiled and to unbelievers, nothing is clean: but both their mind and their conscience are defiled.
Titus 1:16 They profess that they know God: but in their works they deny him: being abominable and incredulous and to every good work reprobate.
The verse centers on "all things", "clean", "defiled", "unbelievers", "nothing", and "both". It is saying that the verse draws attention to "all things" and "clean", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 14's "Not giving heed to Jewish fables and..." into verse 16's "They profess that they know God but...", so "all things" and "clean" belong inside that flow. In Titus context, the local focus is Christ, faith, and discipleship.
A plain takeaway is to answer the verse's own emphasis on "all things" and "clean" with trust shaped by these words, not by a vague optimism outside the passage.