When you appreciate the finer elements of style which enable the easy flow from one purpose to another,
and the fine structure which ensures perfect harmony between earlier and later points and topics, you are certain that no abrupt departure occurs as the surah picks up the point on prayer.
However, when we compare the gentle and relaxed transition from the first to the second sections with the quick and sudden transition made here, we may think that this is not sufficiently prepared.
In fact, a jerk is felt here at the sudden turn imposed. Yet this rapid move is intended, not least because it contributes to the instruction of the believers.
The sudden turn shows what a true believer’s attitude should be when he or she hears the call to attend to their spiritual duty while they are totally absorbed with life’s affairs.
Thus, the surah practically tells us that believers do not require much struggle in order to elevate themselves above their preoccupations with family and children.
They can always lift themselves immediately in order to attend to their superior duty.
In this they say to the whole world, ‘Leave us alone; we want to offer our worship.’