"WHAT DO YOU BELIEVE IS TRUE EVEN THOUGH YOU CANNOT PROVE IT?"

Great minds can sometimes guess the truth before they have either the evidence or arguments for it (Diderot called it having the "esprit de divination"). What do you believe is true even though you cannot prove it?

Notable thinkers and scientists provide their answers at <a href="http://www.edge.org/q2005/q05_print.html" target="new">Edge</a>.