As far as I know, Whitehead never read Wittgenstein. He told me, howev — Ludwig Wittgenstein

"There are, indeed, things that cannot be put into words. They make themselves manifest. They are what is mystical. (6.522)"

"One often makes a remark and only later sees how true it is."

"Dont get involved in partial problems, but always take flight to where there is a free view over the whole single great problem, even if this view is still not a clear one."

"I cannot get from the nature of the proposition to the individual logical operations!!! That is, I cannot bring out how far the proposition is the picture of the situation. I am almost inclined to give up all my efforts. ——"

"Language is a part of our organism and no less complicated than it."

"You wont — I really believe — get too much out of reading it. Because you wont understand it; the content will seem strange to you. In reality, it isnt strange to you, for the point is ethical. I once wanted to give a few words in the foreword which now actually are not in it, which, however, Ill write to you now because they might be a key for you: I wanted to write that my work consists of two parts: of the one which is here, and of everything which I have not written. And precisely this second part is the important one."