As Salaam Alaykum Wa Rahmatullahi Wa Barakatuhu
But what could tell you that per chance he might become pure (from sins)? (Abasa 80:3)
I was reading this this morning and I just have to say Subhan'Allah!! This verse is so touching because it is a message so direct from Allah Taala to RasulAllah (PBUH) and to all of us - and shows how much Allah Taala is the only one who truly sees the good and bad in the hearts and how much he loves his servants to make sure they are not neglected from his zikr so that they can become purified.
You must read the first few ayahs of this surah to understand.
Can I get a Takbeeer?...
ALLAHU AKBAR!!!
Also it is important to see that you really don't know who Allah Taala will guide - I have personally seen people become Muslim that i would never think would become Muslim because of their history.
More famous examples of convert stories are Malcolm X (ex-drug dealer, and convict), Yvonne Ridley (was a journalist for a christian newspaper who was captured by the taliban), Yusuf Estes (former preacher of christianity), napolean from outlawz (a former rapper), and many other people
Subhana kallahumma wa bihamdika ash-haduana la illaha illa ant astaghfiruka wa atubu ilayk, Ameen.