I refer to the commonly called "intuitive" process by which we apprehend the feelings and thoughts of other minds through the external signs of movement, vocal sound, etc., which make up expression and language.

This kind of knowledge, which is not sufficiently marked off from external perception on the one side and introspection on the other, I venture to call Insight.
I am well aware that this interpretation of the mental states of others is commonly described as a process of inference involving a conscious reference to our own similar experiences.

I willingly grant that it is often so.

At the same time, it must be perfectly plain that it is not always so.

It is, indeed, doubtful whether in its first stages in early life it is invariably so, for there seem to be good reasons for attributing to the infant mind a certain degree of instinctive or inherited capability in making out the looks and tones of others.[107] And, however this may be, it is certain that with the progress of life a good part of this interpretation comes to be automatic or unconscious, approximating in character to a sense-perception.