Nietzsche - On Fathoming the Human Mind

The human soul and its limits, the range of man's inner experiences hitherto attained, the heights, depths, and distancesof these experiences, the entire history of the soul UP TO THE PRESENT TIME, and its still unexhausted possibilities: this isthe preordained hunting-domain for a born psychologist and lover if a "big hunt". But how often must he say despairingly tohimself: "A single individual! alas, only a single individual! and this great forest, this virgin forest!" So he would like to have some hundreds of hunting assistants, and fine trained hounds, that he could send into the history of the human soul, to drive HIS game together. In vain: again and again he experiences, profoundly and bitterly, how difficult it is to find assistants and dogs for all the things that directly excite his curiosity. The evil of sending scholars into new and dangerous hunting-domains, where courage, sagacity, and subtlety in every sense are required, is that they are no longer serviceable just when the "BIG hunt," and also the great danger commences,--it is precisely then that they lose their keen eye and nose...

--Friedrich Nietzsche, Beyond Good and Evil, Helen Zimmern translation