Whatever Allāh grants to people of mercy - none can withhold it; and whatever He withholds - none can release it thereafter. And He is the Exalted in Might, the Wise.
The keys to everything are in Allah's hands. So whatever provision, guidance or good fortune He opens up for people, nobody has the ability to stop it. And whatever He stops of this, there is nobody who is able to send it after He has stopped it. And He is the Mighty whom nobody can overpower, Wise in His creating, decreeing and planning.