If we nonetheless leave science aside now in dealing with the question what it is to form ideas, we do so not in the proud delusion that we have all the answers, but out of discretion inspired by a lack of knowledge.

The word "idea" comes from the Greek εἶδω which means to see, face, meet, be face-to-face.

We stand outside of science. Instead we stand before a tree in bloom, for example---and the tree stands before us. The tree faces us. The tree and we meet one another, as the tree stands there and we stand face to face with it. As we are in this relation of one to the other and before the other, the tree and we are. This face-to-face meeting is not, then, one of these "ideas" buzzing about in our heads. Let us stop here for a moment, as we would to catch our breath before and after a leap. For that is what we are now, men [sic] who have leapt, out of the familiar realm of science and even, as we shall see, out of the realm of philosophy. And where have we leapt? Perhaps into an abyss? No! Rather, onto some firm soil. Some? No! But on that soil upon which we live and die, if we are honest with ourselves. A curious, indeed unearthly thing that we must first leap onto the soil on which we really stand. When anything so curious as this leap becomes necessary, something must have happened that gives food for thought. Judged scientifically, of course, it remains the most inconsequential thing on earth that each of us has at some time stood facing a tree in bloom. After all, what of it? We come and stand facing a tree, before it, and the tree faces us, meets us. Which one is meeting here? The tree, or we? Or both? Or neither? We come and stand---just as we are, and not merely with our head or our consciousness---facing the tree in bloom, and the tree faces, meets us as the tree it is. Or did the tree anticipate us and come before us? Did the tree come first to stand and face us, so that we might come forward face-to-face with it?

-- Heidegger, What Is Called Thinking?, pages 41-42

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