Charles Spurgeon Commentary Matthew 6:34

"Be not therefore anxious for the morrow: for the morrow will be anxious for itself. Sufficient unto the day is the evil thereof." — Matthew 6:34 (ASV)

Understand the former verses as the argument to this “therefore.” Anxiety cannot help you (verse 27). It is quite useless, it would degrade you to the level of the heathen (verse 32) and there is no need for it (verse 33)—therefore do not forestall sorrow by being anxious about the future. Our business is with today. We are only to ask for bread day by day, and that only in sufficient abundance for the day’s consumption.

To import the possible sorrows of tomorrow into the thoughts of today is a superfluity of unbelief. When tomorrow brings sorrow, it will bring strength for that sorrow. Today will require all the vigor we have to deal with its immediate evils. There can be no need to import cares from the future. To load today with trials not yet arrived, would be to overload it. Anxiety is evil, but anxiety about things which have not yet happened is altogether without excuse.

“Cast foreboding cares away,
God provides for today.”

O my heart, what rest there is for you if you will give yourself up to your Lord and leave all your own concerns with Him! Mind your Lord’s business, and He will see to your business.

You cannot live in tomorrow, so do not fret about tomorrow.

You live in today, so think of today, spend today to God's glory, and leave the care about tomorrow until tomorrow comes.