"Wait upon the Lord", sometimes it's just so necessary.

Isaiah 40:28-31
28 Have you not known? Have you not heard?
The Lord is the everlasting God,
    the Creator of the ends of the earth.
He does not faint or grow weary;
    his understanding is unsearchable.
29 He gives power to the faint,
    and to him who has no might he increases strength.
30 Even youths shall faint and be weary,
    and young men shall fall exhausted;
31 but they who wait for the Lord shall renew their strength;
    they shall mount up with wings like eagles;
they shall run and not be weary;
    they shall walk and not faint.

The most familiar, and perhaps the most impressive, description of prayer in the Old Testament, is found in those numerous passages where the life of communion with God is spoken of as a waiting upon Him.  A great scholar has given a beautiful definition of waiting upon God: "To wait is not merely to remain impassive.  It is to expect-to look for with patience, and also with submission.  It is to long for, but not impatiently; to look for, but not to fret at the delay; to watch for, but not restlessly; to feel that if He does not come we will submit, and yet to refuse to let the mind submit to the feeling that He will not come."
Now, do not let anyone say that such a life is visionary and unprofitable.    Who is so practical as God?  Who among men so wisely directed His efforts to the circumstances and the occasions which He was called to face, as the Son of Man who is in heaven?  Those who pray well, work well.  Those who pray most, achieve the grandest results.  To use the striking phrase of John Tauler, "In God, nothing is hindered."

Adapted from "The Hidden Life of Prayer" by David MacIntyre