God's compassion to our Prophet(PBUH)

Surah Alanaam, verse 33:

قَدْ نَعْلَمُ إِنَّهُ لَيَحْزُنُكَ الَّذِي يَقُولُونَ فَإِنَّهُمْ لَا يُكَذِّبُونَكَ وَلَٰكِنَّ الظَّالِمِينَ بِآيَاتِ اللَّهِ يَجْحَدُونَ

"We know indeed the grief which their words cause you (O Muhammad). Yet it is not you that they deny, but it is the Verses (the Quran) of Allah that the wrong-doers deny."

What amazes me about this verse is that God is comforting our beloved prophet Muhammad (PBUH) in the most compassionate of ways. He is telling him "don't worry, it's not you they're not believing in, it's My words they're not believing in". As if God is telling him "don't take it personally". Or "don't let it get to you". 

We see reflections of God's mercy to Prophet Muhammad repetitively in the Quran, yet some verses are more obvious than others. 

Read this verse in Surah Ash-shura, verse 48:

فَإِنْ أَعْرَضُوا فَمَا أَرْسَلْنَاكَ عَلَيْهِمْ حَفِيظًا إِنْ عَلَيْكَ إِلَّا الْبَلَاغُ وَإِنَّا إِذَا أَذَقْنَا الْإِنسَانَ مِنَّا رَحْمَةً فَرِحَ بِهَا وَإِن تُصِبْهُمْ سَيِّئَةٌ بِمَا قَدَّمَتْ أَيْدِيهِمْ فَإِنَّ الْإِنسَانَ كَفُورٌ

"But if they turn away from you (O Muhammad), then We have not sent you as a protector over them. Your duty is to convey the Message. And verily, when We give man a taste of Our Mercy, he rejoices, but when some ill befalls them because of the deeds which their hands have sent forth, then verily, man is ungrateful."

The beginning of this verse is almost subtly comforting Prophet Muhammad(PBUH), but then it starts speaking of how man is ungrateful to God's blessings. 

At first, I could not relate those two issues together. What does the second part of the verse have to do with the first part? What does man's nature of rejecting God's blessing have to do with people rejecting Prophet Muhammad's message?

And then there is the correlation! God is as if saying to our beloved Prophet : "Don't be upset when they turn away from your message, because look how often people reject my blessings". What a beautiful way to comfort and support the final messenger! 

We see similar verses in the Quran showing God's mercy and support to Prophet Muhammad(PBUH). And each have a beauty of their own.