All great progress takes place when two sciences come together, and when their resemblance proclaims itself, despite the apparent disparity of their substance.
Henri PoincarePure logic could never lead us to anything but tautologies; it can create nothing new; not from it alone can any science issue.
Henri PoincareExperiment is the sole source of truth. It alone can teach us something new; it alone can give us certainty.
Henri Poincare