The consequence of having seen God is madness, not in the sense that one becomes mentally ill, no, but that a kind of madness is set between you and others: people cannot nor will not understand you.
Madness string 82990
From what I know, the speed of light is the limitation we're facing. The light from extremely far away places is expanding faster than the speed of light can reach us, so in an infinite amount of time, we'll never get to see or even know about what was there.