a simply can be segregated into two parts- simple and complex ideas. so where the ideas come from? Are they authentic to our world when it comes to our mind? Some philosophers proposed the way to get knowledge is ideas. On the other hand, Plato thinks that 'all learning is recollection'. When you started to formulate the ideas your mind will go blank as Locke wrote in 'Essay on Human Understanding'. He writes, at the birth human mind is 'Tabula Rasa', a blank slate.