Passage
and they shall be--the two--for one flesh; so that they are no more two, but one flesh;
and they shall be--the two--for one flesh; so that they are no more two, but one flesh;
Mark 10:6 but from the beginning of the creation, a male and a female God did make them;
Mark 10:7 on this account shall a man leave his father and mother, and shall cleave unto his wife,
Mark 10:8 and they shall be--the two--for one flesh; so that they are no more two, but one flesh;
Mark 10:9 what therefore God did join together, let not man put asunder.'
Mark 10:10 And in the house again his disciples of the same thing questioned him,
The verse centers on "shall", "be--the", "two--for", and "flesh". It is saying that the verse draws attention to "shall" and "be--the", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 7's "on this account shall a man leave..." into verse 9's "what therefore God did join together let...", so "shall" and "be--the" 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 "shall" and "be--the" with trust shaped by these words, not by a vague optimism outside the passage.