To know implies a time sequence. That is, all knowledge is in the past. You can add to it or take away from it, but knowledge is in the field of the past. When I say, ‘I know you,’ I know you because I met you yesterday, so I have an image of you. That image is the past, and I meet you with that image today and I say I know you. But you might have changed, and I come to see you with the image of the past, so I really don’t meet you at all. Knowledge is, in a certain direction, absolutely necessary, like in the scientific and technological field, but knowledge becomes a hindrance in relationship.