Yusuf - 12:103

وَمَا أَكْثَرُ النَّاسِ وَلَوْ حَرَصْتَ بِمُؤْمِنِينَ
[12:103]
And most men will not believe though you desire it eagerly.
Yet no faith will the greater part of mankind have, however ardently thou dost desire it.
And though thou try much, most men will not believe.