Here is the infallible test. Imagine yourself in a situation where you are alone, wholly alone on earth, and you are offered one of the two, books or men. I often hear men prizing their solitude but that is only because there are still men somewhere on earth even though in the far distance. I knew nothing of books when I came forth from the womb of my mother, and I shall die without books, with another human hand in my own. I do, indeed, close my door at times and surrender myself to a book, but only because I can open the door again and see a human being looking at me.
Martin BuberAs long as the firmament of the You is spread over me, the tempests of causality cower at my heels, and whirl of doom congeals.
Martin BuberThe basic word I-Thou can be spoken only with one's whole being. The concentration and fusion into a whole being can never be accomplished by me, can never be accomplished without me. I require a Thou to become; becoming I, I say Thou.
Martin BuberAbout what mainly constituted what you ask, it was something other. It was just a certain inclination to meet people. And as far as possible, to change something in the other, but also to let me be changed by him. At any event, I had no resistance, I put no resistance to it. I already began as a young man. I felt I have not the right to want to change another if I am not open to be changed by him as far as it is legitimate.
Martin Buber