There is not, in fact, any such thing as the direct influence of one human being on another apart from use of the physical environment as an intermediary. A smile, a frown, a rebuke, a word of warning or encouragement, all involve some physical change. Otherwise, the attitude of one would not get over to alter the attitude of another.
The Middle Works, 1899-1924 (ed. SIU Press, 1980) - ISBN: 9780809309337