I quarrelled with my brother
I don’t know what about
One thing led to another
And somehow we fell out
The start of it was slight
The end of it was strong,
He said he was right,
I knew he was wrong!

We hated one another.
The afternoon turned black.
Then suddenly my brother
Thumped me on the back,
And said, “Oh, come along!
We can’t go on all night-
I was in the wrong.”
So he was in the right.

-by Eleanor Farjeon

What is the author telling the reader in the 2nd stanza of the poem?