Translation:

24. What! do they say "He has forged a falsehood against Allah"? But if Allah willed He could seal up thy heart. And Allah blots out Vanity and proves the Truth by His Words. For He knows well the secrets of all hearts.

Notes (Tafseer)

4562. If any one has a doubt about a prophet's mission, let him look at the prophet's lfe, at his work, at his character. Allah loves Truth, not Falsehood. Allah's aid goes with Truth, not with Falsehood. The beauty and power of Allah's Word cannot be found in Falsehood. The false man's heart would be sealed, not expanded to new heights, as is that of the Message-bearer of Allah.