Appears 2 times in the Quran. (Root: فكر)
  1. Do they not reflect that their companion has not unsoundness in mind; he is only a plain warner.

  2. Do they not reflect within themselves: Allah did not create the heavens and the earth and what is between them two but with truth, and (for) an appointed term? And most surely most of the people are deniers of the meeting of their Lord.