Younger Traveler, Elder Traveler and others in “Unfinished Business”

They say that they are friends.

No one can be a friend, if you know not whether to trust them.

Don't judge a book by its cover.

Enemies promises were made to be broken.

And yet honesty is the best policy.

He that has too many friends has none.

Ah, but birds of a feather...

I'm unfamiliar with that story. What lesson does it teach?

It has to do with flocking...and togetherness...and to be honest I'm not that familiar with the particulars myself.