man can see what man comprehends

Man’s mental comprehension of the Information obtained by his own physical Body’s different receptors - earlier on called Senses; as examples:

Hearing, Sight, Smell, Taste and the movement and balance sense.

Man’s mental comprehension is based upon in his head-brain physically-organic pre-existing neural connections.

Upmodern scientific research has shown: 

The process of thinking itself does in real-time change human genes - it is solely a matter of numbers-of-repetitions of the same or a similar/nearby process of thought until a specific Point-of-View is organically established within the head-Brain.

= Man can comprehend what his Brains pre-existing neuronal Network physically allows him. 

There is a saying about, going like this:

Man can see what he understands.

Whatsoever this might be what a Man can think - scientifically proofed several times - according the unnumbered, by the single man himself unknown neuronal connections from here to there to wherever;

Whatever a man‘s thought, one thing can safely be said: 

Man‘s thoughts reflect - based upon above explained organic causes - mainly his Brain (=the construction of the neuronal network in his head-Brain) than the in real-time incoming impressions of the senses (Hearing, Sight, Smell, Taste, Propriozeption) from the physical outer world, that world which is commonly called Reality.

That “real world” which everyone is sooooo sure to naturally

- so to say - 

“automatically grasp along the way”.