Does Tomorrow Make You Worry? (Proverbs 3:5-6 )
Trust in the LORD with all your heart, and do not lean on your own understanding. 6 In all your ways acknowledge him, and he will make straight your paths. [7 Be not wise in your own eyes; fear the LORD, and turn away from evil.] —Proverbs 3:5-6 
Lloyd-Jones writes for those who fear the future:
The difficulty with people who are a prey to these fears is that they are controlled by the future, they are dominated by thoughts of it, and there they are wringing their hands, doing nothing, depressed by fears about it. In fact, they are completely governed and mastered by the unknown future, and that is always wrong. To take thought is right, but to be controlled by the future is all wrong.
Now that is a fundamental proposition and the world has discovered it. It has told us not to cross our bridges until we get to them. Put that into you Christian teaching, for the world is right there, and the Christian must accept that wisdom. Don’t cross your bridges until you come to them.
Indeed, many Scriptural statements to the same effect have become proverbial—”take no thought for the morrow”, “Sufficient unto the day is the evil thereof”.
Certainly the New Testament raises that concept and puts it in its spiritual form. But it is true on the lowest level—”Sufficient unto the day is the evil thereof”. That is sound common sense...
Live in the present to the maximum and do not let your future mortgage your present any more than you should let the past mortgage your present.
Spiritual Depression, p. 68.