"That prescientific cognitive act which is the source of our ideologies is also the prerequisite of our scientific work. No new depar- ture in any science is possible without it. Through it we acquire new material for our scientific endeavours and something to formulate, to defend, to attack. Our stock of facts and tools grows and rejuvenates itself in the process. And so - though we proceed slowly because of our ideologies, we might not proceed at all without them'. ". Schump