All that can be admitted is that sometimes we possess thoughts (concepts) in an intuitive form, which is an abbreviated or rather peculiar expression, sufficient for us, but not sufficient to communicate it easily to any other given person or persons. Hence it is incorrect to say that we have the thought without the expression; whereas we should rather say that we have, indeed, the expression, but in such a form that it is not easy to communicate it to others. This, however, is a very variable, relative fact. There are always those who catch our thought on the wing, prefer it in this abbreviated form, and would be wearied by the greater development of it required by others. In other words, the thought considered abstractly and logically will be the same; but æsthetically we are dealing with two different intuition-expressions, into which different psychological elements enter. The same argument suffices to destroy, that is, to interpret correctly, the altogether empirical distinctior between an _internal_ and an _external_ language. [Sidenote: _Art and science._] The most lofty manifestations, the summits of intellectual and of intuitive knowledge shining from afar, are called, as we know, Art and Science. Art and Science, then, are different and yet linked together; they meet on one side, which is the æsthetic side. Every scientific work is also a work of art. The æsthetic side may remain little noticed when our mind is altogether taken up with the effort to understand the thought of the man of science and to examine its truth. But it is no longer unnoticed when we pass from the activity of understanding to that of contemplation and see that thought either develop itself before us, limpid, exact, well-shaped, without superfluous or insufficient words, with appropriate rhythm and intonation; or confused, broken, embarrassed, tentative. Great thinkers are sometimes called great writers, while other equally great thinkers remain more or less fragmentary writers even if their fragments have the scientific value of harmonious, coherent, and perfect works.