Isaiah 40:28-31 — Hast thou not known? hast thou not heard, that the everlasting God, the Lord, the Creator of the ends of the earth, fainteth not, neither is weary? there is no searching of his understanding. He giveth power to the faint; and to them that have no might he increaseth strength. Even the youths shall faint and be weary, and the young men shall utterly fall: But they that wait upon the Lord shall renew their strength; they shall mount up with wings as eagles; they shall run, and not be weary; and they shall walk, and not faint.

I’m tired. Actually, I’m weary! A lot of travel, and meetings in a lot of time zones, is adding up to some very long days. So how does that go … are Christians supposed to get that way? And if we do, what are we supposed to do about it. Doesn’t Isaiah say that those who wait on the Lord won’t get weary?
So you know there’s a whole lot of confusion in that, right?
Let’s clear out the idea, first, that Christians shouldn’t get weary. If it was good enough for Jesus, it’s good Enough for me — and Jesus got weary:
He left Judaea, and departed again into Galilee. And he must needs go through Samaria. Then cometh he to a city of Samaria, which is called Sychar, near to the parcel of ground that Jacob gave to his son Joseph. Now Jacob’s well was there. Jesus therefore, being wearied with his journey, sat thus on the well: and it was about the sixth hour. (John 4:3-6)
Of course, even Isaiah doesn’t say we won’t get tired. He says that the Lord will lift us up, and give us power and strength.
Now I know some are going to say that I’m misapplying the text. They will say that the promise relates, somehow, to “spiritual” weariness. “Don’t expect”, they say, “that God will deal with your physical weakness … It’s only spiritually that the Spirit will refresh you.” I think they are far from the truth. Alexander Maclaren describes the case exactly:
He crowns that restoration by making the restored weakling like Himself. ‘He fainteth not, neither is weary.’ They, too, ‘shall run and not be weary, they shall walk and not faint.’ In the long drawn out grind of monotonous marching along the common path of daily small duties and uneventful life, they shall not faint; in the rare occasional spurts, occurring in every man’s experience, when extraordinary tax is laid on heart and limbs, they shall not be weary.
So why am I weary? I think it’s because I’m not spending no enough time getting refreshed! If I want water, I have to go to the well. Isaiah says it’s very simple. If you get weary, wait patiently and God will give us strength!
I’m waiting.