Translation:

19. Is then one who doth know that that which hath been revealed unto these from thy Lord is the Truth like one who is blind? It is those who are endued with understanding that receive admonition

Notes (Tafseer)

1834. In this section the contrast between Faith and Righteousness on the one hand and Infidelity and Evil on the other is set out. The righteous man is known as one who (1) receives admonition; (2) is true to his covenants; (3) follows the universal Religion of Faith and Practice joined together; (4) is patient and persevering in seeking Allah; and in practical matters he is known to be; (5) regular in prayer; (6) generous in true charity, whether open or secret; and (7) not revengeful, but anxious to turn off evil with good, thus breaking the chain of evil which tends to perpetuate itself.