This post from Are We Doing Anything Today blew me away:
[Warren Buffett] told of the Founder of the Nebraska Furniture Mart, one of his companies, and how she came from a poor Jewish family and couldn't read, write or speak English. She was had survived the Holocaust, spent 16 years bringing her family to the U.S. (at $50 per person), and grew the Nebraska Furniture Mart from a $500 initial investment to do $350 Million annually from a single location in Omaha.
She told Warren at one point that the way she evaluated people was simple:
She simply asked herself, "Would they hide me?"
What a great way to judge your instincts about whether to trust someone or not.