Matthew 22:29

Do err. Gr. planao (see on ch. 18:12). The Sadducees proved that the educated can be as ignorant and as steeped in error as the unlearned. Wise in their own philosophy though the Sadducees were, their information on this subject was incomplete, and there was at least one vital factor they had not considered — “the power of God.” Jesus went on to show that although the doctrine of the resurrection may not be as explicitly taught in the OT as some might wish, it is implicit throughout the OT.

Not knowing the scriptures. The Sadducees are said to have prided themselves on being more exact students of the Scriptures than the Pharisees, but Jesus here asserts that in spite of all their vaunted knowledge of the Word of God, they are profoundly ignorant. Theological concepts based on speculative reasoning from incomplete information are certain to lead astray those who resort to this fanciful method of arriving at truth. Christians today should beware lest they, too, “err, not knowing the scriptures.”