Who can recognize the signs of God that exist in the heavens and the earth ?

Verse 3 of chapter 45:

Verily, in the heavens and the earth are signs for the believers.

Verse 13 of chapter 45:

And has subjected to you all that is in the heavens and all that is on the earth; it is all (as a favor and kindness) from Him. Verily, in it are signs for a people who think deeply.