doubt
"Doubt is like your shadow. It's always there. Especially on sunny days. Just accept it. It goes wherever you go."
"Doubt is like a faithful but mangy dog that sleeps at your feet and every time you get up and walk two steps he never fails to be right on your heels"
"Doubt is like a cloud that obscures your view of the truth"
"Doubt is like the AIDS virus. It doesn't kill directly, but makes you susceptible to death by common disease (common temptation)."

METAMIA is a free database of analogy and metaphor. Anyone can contribute or search. The subject matter can be anything. Science is popular, but poetry is encouraged. The goal is to integrate our fluid muses with the stark literalism of a relational database. Metamia is like a girdle for your muses, a cognitive girdle.