On The Flash Season 2 Episode 21, Barry learned a thing or two about himself while in the speed force, as his friends worked hard to bring him out.
I will never grow tired of Grant Gustin's eyes filled with tears. One could get lost in those eyes.
Barry's eyes were welled up a lot on The Flash Season 2 Episode 21 because the speed force itself thought Barry would be more comfortable communicating with his loved ones than unknown faces.
Why were they communicating? I guess that's the only way he could get become one with the force again. No matter. It worked.