 if god were to punish his creation he would punish them. that is why he said and if god were to punish people for what they have earned he would not leave a single creature on the earths surface. but he accepts repentance forgives mistakes and rewards good deeds many times over.
ولو تقصى الله على خلقه لعذبهم، ولذلك قال ولو يؤاخذ الله الناس بما كسبوا ما ترك على ظهرها من دابة . ولكنه قبل التوبة، وأقال العثرة، وجعل بالحسنة أضعافها.