Measuring the Immeasurable

The present system of paying for every sort of service was not in vogue among the adherents of Bushido. It believed in a service which can be rendered only without money and without price. Spiritual service, be it of priest or teacher, was not to be repaid in gold or silver, not because it was valueless but because it was invaluable ... whereas the best service done in education, namely, in soul development, is not definite, tangible, or measurable. Being immeasurable, money, the ostensible measure of value, is of inadequate use.

-Inazo Nitobe, Bushido, the Soul of Japan