English Translation of Al-Quran
.Surah Ar-Rum [The Romans]
Ayat 59. Thus does Allah seal up the hearts of those who know not [the proofs and evidence of the Oneness of Allah i.e. those who try not to understand true facts that which you (Muhammad [SAWW](PBUH) have brought to them].
Ayat 60. So be patient (O Muhammad[SAWW](PBUH). Verily, the Promise of Allah is true, and let not those who have no certainty of faith, discourage you from conveying Allah’s Message (which you are obliged to convey).
Tafseer of Surah Al Rum (The Romans) Ayat 59 and 60. Thus does Allah seal up the hearts of those who understand not. When an attitude of obstinate resistance to Truth is adopted, the natural consequence (by Allah’s Law) is that the heart and mind get more and more hardened with every act of deliberate rejection. It becomes more and more impervious to the reception of Truth, just as a sealed envelope is unable to receive any further letter or message after it is sealed (Cf. 2:7 and n. 31, 6:46 , and 16:108). 60. So patiently persevere: for verily the promise of Allah is true: nor let those shake thy firmness, who have (themselves) no certainty of faith. The Prophet of Allah does not slacken in his efforts or feel discouraged because the Unbelievers laugh at him or persecute him or even seem to succeed in blocking his Message. He has firm faith, and he knows that Allah will finally establish His Truth. He goes on in his divinely entrusted task, with patience and perseverance, which must win against the levity of his opponents, who have no faith or certainty at all to sustain them.