Faramir resembled his father in many ways, yet Aragorn was struck most by where he differed.
Denethorís eyes were steel and fire in the brightness of a summer morning; cold yet scorching, seeing more than one would want to show. And Aragorn knew he saw more than a ranger.
Faramirís eyes were fevered and weary in the dimness of a torch-lit room. Yet, underneath the shadows kindled a fire piercing through the darkness - a steel-grey gaze, intense yet warm. And Aragorn knew he saw more than a healer.
'My lord, you called me. I come. What does the king command?'
The last line of course is filched verbatim from the book :o