Do not think, he said, that you can understand what another philosopher is saying (and I believe he mentioned Spinoza as an illustration). The nearest you can get to it is this, 'The landscape is familiar. I have been in this neighbourhood myself'.

I went on to ask why he had left his chair in 1947, and I think I can recall the words he used in his reply: 'Because there are only two or three of my students about whom I can say, I do not know I have done them any harm'.

From  Tranoey's reminiscences of Wittgenstein