Why have a Guru?

Some people call a living person as their Guru; some call a book as their Guru; some a dead person; and so on.

I don't have a Guru. I think that we can learn from a living person, a book, a dead person's actions, a tree, a bird, a stone, etc. So why limit ourself to one person or one book?

So, in other words, I have many Gurus. I try to learn from everyone I meet. Today, we are meeting. Have a good day, Guruji!