كَلَّا (NO!) is mentioned thirty-three times in the Holy Qur’an. It is used for prevention and prohibition. Hence, when we read (No) we understand that there is a rebuke before it and a confirmed statement after. But here, we do not find before (No!) a forbidden matter. Accordingly, scholars said that (No) here means “Really”.

As if this verse confirms a fact that: “Man transgresses because he sees himself self-sufficient”.

Transgression means exceeding the limits.