Matthew 22:29-33: in context

The Sadducees have tried to trap Jesus with a riddle about the resurrection, and he answers with a sharp diagnosis: you are wrong, because you know neither the Scriptures nor the power of God. In the resurrection, he explains, people do not marry but are like the angels. And as for the reality of the resurrection itself, he points to God's own words at the bush: I am the God of Abraham, Isaac, and Jacob, present tense; he is not the God of the dead but of the living. The crowds, hearing it, are astonished at his teaching.

Jesus locates the Sadducees' error in two ignorances that go together: they know neither the Scriptures nor the power of God. Their whole problem, denying the resurrection, flowed from underestimating both what God had said and what God could do. They knew the Scriptures well enough to quote them, but not well enough to see that God's very self-description, I am the God of Abraham, present tense, long after Abraham died, implies the patriarchs still live to him. And they had shrunk God's power down to the limits of their own imagination, unable to conceive of a life beyond the grave. These two ignorances still travel together. We go wrong about God whenever we underestimate his word, reading it too shallowly to see what is there, or underestimate his power, deciding in advance what he can and cannot do. The Sadducees' skepticism was not superior knowledge but a double poverty: a thin reading of Scripture and a small view of God. The cure for both is the same, to take God's word more seriously and God's power more seriously than we naturally do.

Where might I be going wrong about God because I underestimate his word, reading it shallowly, or underestimate his power, deciding in advance what he can do?