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