Passage
Jesus said unto them, Is it not for this cause that ye err, that ye know not the scriptures, nor the power of God?
Mark 12:24 (ASV)
Nearby Context
Mark 12:22 and the seven left no seed. Last of all the woman also died.
Mark 12:23 In the resurrection whose wife shall she be of them? for the seven had her to wife.
Mark 12:24 Jesus said unto them, Is it not for this cause that ye err, that ye know not the scriptures, nor the power of God?
Mark 12:25 For when they shall rise from the dead, they neither marry, nor are given in marriage; but are as angels in heaven.
Mark 12:26 But as touching the dead, that they are raised; have ye not read in the book of Moses, in [the place concerning] the Bush, how God spake unto him, saying, I [am] the God of Abraham, and the God of Isaac, and the God of Jacob?
Study Lenses
The verse centers on "jesus", "said", "cause", "scriptures", and "power". It is saying that the verse draws attention to "jesus" and "said", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 23's "In the resurrection whose wife shall she..." into verse 25's "For when they shall rise from the...", so "jesus" and "said" belong inside that flow. In Mark context, the local focus is Christ, faith, and discipleship.
A plain takeaway is to answer the verse's own emphasis on "jesus" and "said" with trust shaped by these words, not by a vague optimism outside the passage.