We can find the answer if we look carefully at Paul’s words. He did not simply say: “We must endure many tribulations. ”
وَلٰكِنْ سُرْعَانَ مَا وَصَلَ مُقَاوِمُونَ يَهُودٌ وَرَاحُوا يَنْشُرُونَ ٱفْتِرَاءَاتٍ بَغِيضَةً لِيُسَمِّمُوا عُقُولَ ٱلنَّاسِ .‏