What does Matthew 6:34 mean?

Matthew 6:34 KJV
Take therefore no thought for the morrow: for the morrow shall take thought for the things of itself. Sufficient unto the day [is] the evil thereof.

Matthew 6:34 MKJV
Therefore do not be anxious about tomorrow; for tomorrow shall be anxious for its own things. Sufficient to the day [is] the evil of it.

Matthew 6:34 NKJV
“Therefore do not worry about tomorrow, for tomorrow will worry about its own things. Sufficient for the day [is] its own trouble.

Matthew 6:34 KJV 2000
Take therefore no thought for tomorrow: for tomorrow shall take thought of the things for itself. Sufficient unto the day is the evil thereof.

Interlinear KJV

Take /merimnao/ therefore /oun/ no /me/ thought /merimnao/ for /eis/ the morrow: /aurion/ for /gar/ the morrow /aurion/ shall take thought /merimnao/ for the things /ho/ of itself. /heautou/ Sufficient /arketos/ unto the day /hemera/ is the evil /kakia/ thereof. /autos/

Albert Barnes’ Commentary

Verse 34. No Barnes text on this verse. See Barnes for Mt 6:32-34
For Remarks on Chapter 6, See Barnes for Mt 6:34, end of verse.
{q} “the things of itself” De 23:25; Heb 13:5,6

Ripley 4 Gospel

The evil thereof; the care and perplexity pertaining to it. For any one day, the perplexity, or cares, properly pertaining to it, is enough. Bring not, in addition, the care and trouble belonging to the morrow.

Does the Saviour discourage all concern about the future days, or years, of our lives? No. He dissuades us from perplexing anxiety about the future, and from a distrustful fear that our necessities will not be provided for. The proper business of each day is to be performed in that day, and its anxieties are not to be increased by anticipating the wants of following days. Yet such is the plan of divine providence, that the performance of daily duties in their proper time is followed with blessings in days and years yet to come. As in the case of the farmer: it is his duty, at certain times, to sow; but the performance of this duty is succeeded by blessings months afterwards. He would transgress the Saviour’s directions, if, to the care and trouble connected with sowing, he should add misgivings and perplexity respecting the result of his labors. A similar remark may be made in reference to every human employment.

British Family Bible

Take therefore no thought for the morrow: See note at Mt 6:25. By “the morrow” is not meant the very next day only, but, according to the import of the Eastern phrase, any future time, at what distance soever. Bp. Atterbury.

Sufficient unto the day &c. Sufficient to the present time are the present troubles of life, and God would not have us add to them by an unreasonable solicitousness for the future. Dr. S. Clarke.