As Director of the Central Intelligence Agency, he has continued to serve with characteristic intellectual rigor, dedication, and patriotism.

WHITEHOUSE: The White House

My favorite fiction displays a combination of intellectual rigor, emotional intelligence, formal ingenuity, and interesting aesthetics, which is related to formal arrangement.

NEWYORKER: C. E. Morgan

Some even adorned the dress of intellectual rigor.

FORBES: Cold Fusion: Theory or Fact?