Human Contingency and Dependence on Allah

وَلَوْ نَشَآءُ لَجَعَلْنَا مِنكُم مَّلَـٰٓئِكَةً فِى ٱلْأَرْضِ يَخْلُفُونَ

And if We willed, We could have made [instead] of you angels succeeding [one another] on the earth.