K. Popper on theories that are not (yet?) scientific

“I thus felt that if a theory is found to be non-scientific, or ‘metaphysical’ (as we might say), it is not thereby found to be unimportant, or insignificant, or ‘meaningless’, or ‘nonsensical’. But it cannot claim to be backed by empirical evidence in the scientific sense—although it may easily be, in some genetic sense, ‘the result of observation’.”

Quoted from: K. Popper, Conjectures and Refutations, Routledge (2008) p.50-51