Passage
But *thou*, [when] fasting, anoint thy head and wash thy face,
But *thou*, [when] fasting, anoint thy head and wash thy face,
Matthew 6:15 but if ye do not forgive men their offences, neither will your Father forgive your offences.
Matthew 6:16 And when ye fast, be not as the hypocrites, downcast in countenance; for they disfigure their faces, so that they may appear fasting to men: verily I say unto you, They have their reward.
Matthew 6:17 But *thou*, [when] fasting, anoint thy head and wash thy face,
Matthew 6:18 so that thou mayest not appear fasting unto men, but to thy Father who is in secret; and thy Father who sees in secret shall render [it] to thee.
Matthew 6:19 Lay not up for yourselves treasures upon the earth, where moth and rust spoils, and where thieves dig through and steal;
The verse centers on "thou", "fasting", "anoint", "head", "wash", and "face". It is saying that the verse draws attention to "thou" and "fasting", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 16's "And when ye fast be not as..." into verse 18's "so that thou mayest not appear fasting...", so "thou" and "fasting" belong inside that flow. In Matthew context, the local focus is Christ, faith, and discipleship.
A plain takeaway is to answer the verse's own emphasis on "thou" and "fasting" with trust shaped by these words, not by a vague optimism outside the passage.