Once a person attains more emuna, he or she must be careful. They have succeeded in learning more Torah or purified the way they conduct their business affairs or both. Now, they have more Divine illumination. Just as ants in the kitchen are attracted to sugary substances, the dark-side forces will try to attach themselves to, feed off of and hijack our emuna. We therefore must guard our emuna like the royal guard in Buckingham Palace guards the Hope Diamond.