“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. He gives power to the faint, and to him who has no might he increases strength. Even youths shall faint and be weary, and young men shall fall exhausted; 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.”
Isaiah 40:28-31 ESV
The fact of the matter is that at times I will be spiritually spent and exhausted but this is part of the life. Some are not able to feed themselves spiritually and they must have a shepherd lead them to ensure they are being fed and growing. However we must also tend to our own souls as well. Peter was given the mandate to feed and take care of the sheep (John 21:15-17). This was assuming that he would remain connected to the vine as Jesus had taught him (John 15). Jesus doesn’t tell him to take care of himself because Peter knows now that his care comes from the Lord.
God reserves the right to exhaust His servants and use them as He sees fit. But it also clear that He teaches us to take a Sabbath and at times He makes us to lie down in green pastures. The Lord doesn’t want His Saints burned out for the Kingdom; He wants them burning with the eternal oil of the Holy Spirit. Is this why we are commanded to be “filled” (Ephesians 5:18) with Holy Spirit, not because we are sinning but because we are burning?
In whatever season we are in, we are to look to Him as our Sustainer and Provider.