إِنَّ مَعَ الْعُسْرِ يُسْرًا
Indeed, with hardship is ease.
Verses 94:5–6 repeat the same core affirmation. Al-ʿusr is definite and yusran indefinite, a distinction discussed in exegetical and rhetorical treatments of repetition.
The secure observation is strengthened reassurance through recurrence. Turning the nouns alone into an unqualified numerical rule for every circumstance would exceed what the verse explicitly states.