For the mind to ponder. . .

Now, as for man, when his Lord trieth him, giving him honour and gifts, then saith he, (puffed up) "My Lord hath honoured me." But when He trieth him, restricting his subsistence for him, then saith he (in despair) "My Lord hath humiliated me!"

(Quran 89:15-16)

For the eyes. . .