When thy little heart doth wake
Then the dreadful night shall break

by William Blake

Remember Bertram saying this poem at the end of an episode, to Lisbon and LaRoche? 

Here is what I think. Bertram didn't say this because he is a friend of Red John. He told this because he simply heard it from Red John, without actually knowing that the person is Red John.

In the last aired episode, they focused on Bertram and his poker thing. Bertram is stubborn, he has to win at poker. He can't even bluff, so there is no way he is Red John. Red John is a manipulator of mind.

He is also not Red John's accomplice. He would never be so foolish to reveal himself this easily by telling the poem.

He simply heard it and wanted to use it. Like an interesting word you recently learned and try to use it to impress people. That's what Bertram is, he learned the poem, found it cool and used it.

But, who told Bertram the poem? Was it a guy from his poker nights? Or a close friend? 

I believe that this poem is not an office thing. You talk about stuff like that when you are enjoying your time, having a drink maybe. So my bet is Red John is a poker mate of Bertram. But this is because we dont know something else about Bertram's personal life. Could be something else too.

What do you think?