Jesus does not expect us to be strong but weak. In our weakness His power reaches perfection (2 Cor 12:9). He does not expect us to be independent and self-sufficient, but rather childlike (Mt 18:3). We don't need will-power, just willingness. He'll provide the power and "authority to expel unclean spirits and to cure sickness and disease of every kind" (Mt 10:1). All He expects is that we give as a gift what has been given us (Mt 10:8) by laboring in His harvest (Mt 9:38). Jesus simply expects us to try and keep trying, to believe and receive, to pray and obey.
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