"We are such stuff
As dreams are made on; and our little life
Is rounded with a sleep." - The Tempest, Act 4, Scene 1
Marxist dialectics, so far as I have the hang of them, are materialist, so there is no sausage factory of truths coming out of thought, without reference to the natural world. Matter comes first, then thought which tries to understand it and practice that puts ideas into practice to change the material world, in a spiral kind of way.