The Paradise is surrounded by hardships and the Hell-Fire is surrounded by temptations.  

قَالَ رَسُولُ اللَّهِ ﷺ حُفَّتِ الْجَنَّةُ بِالْمَكَارِهِ وَحُفَّتِ النَّارُ بِالشَّهَوَاتِ  

This hadith has been narrated on the authority of Abu Huraira through another chain of transmitters.  

عَنِ النَّبِيِّ ﷺ بِمِثْلِهِ  

Allah the Exalted and Glorious, said: I have prepared for My pious servants which no eye has ever seen, and no ear has ever heard, and no human heart has ever perceived but it is testified by the Book of Allah. He then recited:" No soul knows what comfort has been concealed from them, as a reward for what they did". (xxxii. 17)  

عَنِ النَّبِيِّ ﷺ قَالَ قَالَ اللَّهُ ﷻ أَعْدَدْتُ لِعِبَادِيَ الصَّالِحِينَ مَا لاَ عَيْنٌ رَأَتْ وَلاَ أُذُنٌ سَمِعَتْ وَلاَ خَطَرَ عَلَى قَلْبِ بَشَرٍ مِصْدَاقُ ذَلِكَ فِي كِتَابِ اللَّهِ { فَلاَ تَعْلَمُ نَفْسٌ مَا أُخْفِيَ لَهُمْ مِنْ قُرَّةِ أَعْيُنٍ جَزَاءً بِمَا كَانُوا يَعْمَلُونَ}  

Allah, the Exalted and Glorious, said: I have prepared for My pious servants which no eye (has ever) seen, no ear has (ever) heard and no human heart has ever perceived those bounties leaving apart (those bounties) about which Allah has informed you.  

أَنَّ النَّبِيَّ ﷺ قَالَ قَالَ اللَّهُ ﷻ أَعْدَدْتُ لِعِبَادِيَ الصَّالِحِينَ مَا لاَ عَيْنٌ رَأَتْ وَلاَ أُذُنٌ سَمِعَتْ وَلاَ خَطَرَ عَلَى قَلْبِ بَشَرٍ ذُخْرًا بَلْهَ مَا أَطْلَعَكُمُ اللَّهُ عَلَيْهِ  

I have prepared for My pious servants which the eye has seen not, and the ear has heard not and no human heart has ever perceived such bounties leaving aside those about which Allah has informed you. He then recited:" No soul knows what comfort has been hidden for thein".  

قَالَ رَسُولُ اللَّهِ ﷺ يَقُولُ اللَّهُ ﷻ أَعْدَدْتُ لِعِبَادِيَ الصَّالِحِينَ مَا لاَ عَيْنٌ رَأَتْ وَلاَ أُذُنٌ سَمِعَتْ وَلاَ خَطَرَ عَلَى قَلْبِ بَشَرٍ ذُخْرًا بَلْهَ مَا أَطْلَعَكُمُ اللَّهُ عَلَيْهِ ثُمَّ قَرَأَ { فَلاَ تَعْلَمُ نَفْسٌ مَا أُخْفِيَ لَهُمْ مِنْ قُرَّةِ أَعْيُنٍ}  

I was in the company of Messenger of Allah ﷺ that he gave a description of Paradise and then Allah's Apostle ﷺ concluded with these words: There would be bounties which the eye has not seen and the ear has not heard and no human heart has ever perceived them. He then recited this verse:" They forsake (their) beds, calling upon their Lord in fear and in hope, and spend out of what We have given them. So no soul knows what refreshment of the eyes is hidden for them: a reward for what they did" (xxxii. 16-17)  

قَالَ سَمِعْتُ سَهْلَ بْنَ سَعْدٍ السَّاعِدِيَّ يَقُولُ شَهِدْتُ مِنْ رَسُولِ اللَّهِ ﷺ مَجْلِسًا وَصَفَ فِيهِ الْجَنَّةَ حَتَّى انْتَهَى ثُمَّ قَالَ ﷺ فِي آخِرِ حَدِيثِهِ فِيهَا مَا لاَ عَيْنٌ رَأَتْ وَلاَ أُذُنٌ سَمِعَتْ وَلاَ خَطَرَ عَلَى قَلْبِ بَشَرٍ ثُمَّ اقْتَرَأَ هَذِهِ الآيَةَ { تَتَجَافَى جُنُوبُهُمْ عَنِ الْمَضَاجِعِ يَدْعُونَ رَبَّهُمْ خَوْفًا وَطَمَعًا وَمِمَّا رَزَقْنَاهُمْ يُنْفِقُونَ * فَلاَ تَعْلَمُ نَفْسٌ مَا أُخْفِيَ لَهُمْ مِنْ قُرَّةِ أَعْيُنٍ جَزَاءً بِمَا كَانُوا يَعْمَلُونَ}