Working together

Exod 17:11–13 illustrates that, while Moses’ prayer decides the outcome, Joshua’s leading of the charge in the valley is also necessary for victory. The text makes it absolutely clear, where the power to win comes from. Still, the message of this account is different from the Exodus from Egypt, where the struggle against Egypt was fought by YHWH alone (through the mediation of Moses; cf. Exod 14:14). Thus, Barth found in Exodus 17:8–16 a lesson of God’s working through man in a delicate balance which neither impaired God’s will nor destroyed man’s genuine activity. This delicate divine-human balance is central to the biblical concept of faith.—Standing in the Breach, page 76

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The technical term is synergism—working together—versus monergism, which claims it is only God doing everything; humans are basically puppets in that system.
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