What is out of lennies mind in 'Of Mice and Men'?

In the book in chapter six you can see that Lennie is seeing both his Aunt Clara and a rabbit. They are out of lennies mind because it is really his conscience and not them. So they tell him what he did was wrong and that he shouldn't hide and thent hey go away when George come and they say some stuff and Lennie dies. well that is what is out of lennies mind