What can we trust?

Jesus said, "This is why you get sick and die:  Because you love what deceives you.  Anyone who thinks should consider these matters."  The Gospel of Mary, by Karen L. King

Sounds like if we trust what deceives us, we're headed for trouble.  We see that plot in novels and movies all the time -- a person with good intentions trusts someone with not so good intentions, and the story develops from there.

So what do you trust?  What have you found to lean on that won't deceive you?