Thy Valour is From God

Both Atrides and Achilles remind each other that their strength and power comes from God, but each would use this argument to persuade the other to use their gifts for their own ends. The argument isn't really whether their gifts are from God, but in what way those gifts serve God best.

If thou hast strength, 'twas Heaven that strength bestow'd;

For know, vain man! they valour is from God.