III

quien enfoca con nitidez y a la altura adecuada, que es la del hombre; quien atrapa o 

captura o más bien absorbe la imagen que está ante él, tiene mucho ganado

(Javier Marías)

The sentence is self-evident ...
if you focus on something you will understand or know more.

But Deza is saying we can do more than 
look he says go beyond looking, looking is a ental process 
he says if you can you should absorb, soak it up, suck it in 
absorb the scene that is focused on without looking or thinking, 

 ... absorbing as a reflex action that needs no mental processing.