How did Faramir know?

[Osse]

We must take into account that aragorn healed not only with his body, but with his mind. He gives us this impression when he talks to the people he had cured; "i called long for you." (please excuse rough quotes) " i searched for you and pulled you from the darkness".

When he was 'calling' to faramir, i always imagined him saying something along the lines of; "Faramir, come back to the light. I am Elessar, your king, and i command it."
(perhaps not exactly like that but it's hard to explain nes pas?)

This is not a plot hole, but allows use of the readers imagination. If you look at it purely on what was said and done, there is enough to spur your imagination, yet (as someone said above, but i heartily disagree) not enough to just use the facts. Even without using my imagination i am convinced.

Osse