And those who have no knowledge say: Why does not Allah speak to us or a sign come to us? Even thus said those before them, the like of what they say; their hearts are all alike. Indeed We have made the communications clear for a people who are sure.

Allah is He Who raised the heavens without any pillars that you see, and He is firm in power and He made the sun and the moon subservient (to you); each one pursues its course to an appointed time; He regulates the affair, making clear the signs that you may be certain of meeting your Lord.

And when the word shall come to pass against them, We shall bring forth for them a creature from the earth that shall i wound them, because people did not believe in Our communications.

And We made of them Imams to guide by Our command when they were patient, and they were certain of Our communications.

And in your (own) creation and in what He spreads abroad of animals there are signs for a people that are sure;

And in the earth there are signs for those who are sure,