It’s enough to know Umar Bin Abdul Aziz (ra) would meet the fuqaha and they would give reminders about the Hereafter.
A scholar of the past’s book, Maadrijal Salikeen, is all about the heart and cleansing it.
The point is if a person’s heart isn’t clean neither will they get far in seeking knowledge nor will they benefit as a good Muslim as their heart will be full of diseases like jealousy, illegitimate desires, conceit, pride, arrogance and so on!
Their heart will also become a rock and they will be unable to shed tears for the sake of Allah!
And as we know, the da’wah started not just with Tawheed but rather with Jannah and Jahannum to soften the hearts!