What is called thinking?

WHAT IS CALLED THINKING? by Martin Heidegger, A Translation of Was Heisst Denken, by Fred D. Wieck and J. Glenn Gray, London : Harper & Row, 1960

"What is called thinking?" says for one thing, and in the first place: what is it we call "thought" and "thinking," what do these words signify? What is it to which give the name "thinking"?

"What is called thinking?" says also, in the second place :how does traditional doctrine conceive and define what we have named thinking? What is it that for two and a half thousand years has been regarded as the basic characteristic of thinking? Why does the traditional doctrine of thinking bear the curious title "logic"? 

"What is called thinking?" says further, in the third place: what are the prerequisites we need so that we may be able to think with essential lightness? is called for on our part in order that may each time achieve good thinking?

What is called thinking?" says finally,, in the fourth place : what is it that calls us, as it were, us to think? is it that calls us into thinking?

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