Commentary
Truth and Falsehood were explained through parables in verses appearing previous to those cited above. Now, in the present verses, there is a description of the distinguishing marks and attributes of the people of Truth and the people of Falsehood, along with a description of their good and bad deeds, and their reward and punishment.
The first verse (18) carries a description of the good return reserved for those who obey Divine injunctions and act in accordance with them, and conversely, of the severe punishment for those who disobey them and act negatively.
In the second verse (19), the two groups have been identified as the sighted and the blind through a parable and, at the end, it was said: إِنَّمَا يَتَذَكَّرُ أُولُو الْأَلْبَابِ that is, 'only the people of understanding respond to the advice.' It means what has been exemplified here is, though, fairly clear and obvious, yet it can only be understood and appreciated by those who have their essential reason intact with them. Those who have their faculty of reason all impaired by heedlessness and disobedience cannot understand a difference so great.
From the third verse (20) begins a description of particular deeds and marks which distinguish the two groups. Taken up first are the attributes of those who believe in and obey Divine injunctions. The initial at-tribute mentioned is: