أَمْ حَسِبْتُمْ أَن تَدْخُلُواْ الْجَنَّةَ وَلَمَّا يَأْتِكُم مَّثَلُ الَّذِينَ خَلَوْاْ مِن قَبْلِكُم مَّسَّتْهُمُ الْبَأْسَاء وَالضَّرَّاء وَزُلْزِلُواْ حَتَّى يَقُولَ الرَّسُولُ وَالَّذِينَ آمَنُواْ مَعَهُ مَتَى نَصْرُ اللّهِ أَلا إِنَّ نَصْرَ اللّهِ قَرِيبٌ
Or think you that you will enter Paradise without such (trials) as came to those who passed away before you? They were afflicted with severe poverty and ailments and were so shaken that even the Messenger and those who believed along with him said, “When (will come) the Help of Allâh?” Yes! Certainly, the Help of Allâh is near!
[Surah Baqarah / Ayah 214]
As usual…the Quran speaks for itself beautifully. It needs no further comments.