What is meant by “Sufficient unto the day is the evil thereof”?
The reference for this phrase comes from Jesus’ teaching about anxiety and is the conclusion verse (Matthew 6:34). He has just finished teaching about not being anxious because God will provide for all of our needs (Matthew 6:25-33).
He has concluded that we should make it a priority to seek God’s kingdom and his righteousness, then all of these things will be added unto us (Matthew 6:33). He says there’s no need for us to be anxious about tomorrow because tomorrow will take care of itself.
How many of us worry about the future so much so that we don’t even live in the present? This is what Jesus is getting at. We should instead live in the moment of provision for today. God sees the future and the road ahead. We can trust in him to provide everything we need before we even know that we need it.
This phrase comes up, which I believe you are quoting from the KJV. In other versions it may be rendered, “Sufficient for the day is its own trouble.” It simply means that there is enough trouble in this day that we shouldn’t worry about tomorrow.
We’ve got enough to worry about today. And we shouldn’t worry. God will take care of all of the issues that come by today. The amount of evil and trouble in one day is more than enough to concern us. But even those concerns should be put on God. He has promised his provision in every situation.
Each day, including today and tomorrow, brings all of its own concerns, evils, troubles, and everything else that we must deal with. The reason we worry and concern ourselves is because we think it is up to us and our own resources to take care of these things. But God takes care of us and these things. We must trust in his provision and providence.