I thought I would start the list with some verses about seeing God:

John 5:36-38 (this could be a statment to the individuals or for all mankind..lets look further into verses)
36 But I have a greater witness than John’s; for the works which the Father has given Me to finish—the very works that I do—bear witness of Me, that the Father has sent Me. 37 And the Father Himself, who sent Me, has testified of Me. You have neither heard His voice at any time, nor seen His form. 38 But you do not have His word abiding in you, because whom He sent, Him you do not believe.

John 14:9 (See the personality and ways of God, the Father and Son in One)
Jesus said to him, “Have I been with you so long, and yet you have not known Me, Philip? He who has seen Me has seen the Father; so how can you say, ‘Show us the Father’?

Jesus also clarifies in this statment:

John 1:18 (Only Jesus has seen Him in Glory)
No one has seen God at any time. The only begotten Son, who is in the bosom of the Father, He has declared Him.

John 17:5 (Jesus has been with the Father, God, in His full Glory in Spirit.)
And now, O Father, glorify Me together with Yourself, with the glory which I had with You before the world was.