Lord, I'm tired" Jesus, the disciples and the Apostle Paul all got tired, weary and fatigued and so will we. They understood that only rest and recharging their mind, body and spirits would keep them going. They did not tire of fulfilling their calling from the Father, but they dealt with becoming tired from the performing it. We can become tired, weary and fatigued from life and our fulfilling our calling, but as Paul wrote in Galatians 6:9 "Never weary of doing good." God will sustain us, but take time to rest when you need to do so.