medium of the former--a truth finely expressed by Lucian:--

[Greek: _Aeloutos ho taes psychaes ploutus monos estin alaethaes
Talla dechei ataen pleiona ton kteanon_--][1]

[Footnote 1: Epigrammata, 12.]

the wealth of the soul is the only true wealth, for with all other
riches comes a bane even greater than they. The man of inner wealth
wants nothing from outside but the negative gift of undisturbed
leisure, to develop and mature his intellectual faculties, that is,
to enjoy his wealth; in short, he wants permission to be himself,
his whole life long, every day and every hour. If he is destined to
impress the character of his mind upon a whole race, he has only one
measure of happiness or unhappiness--to succeed or fail in perfecting
his powers and completing his work. All else is of small consequence.
Accordingly, the greatest minds of all ages have set the highest value
upon undisturbed leisure, as worth exactly as much as the man himself.
_Happiness appears to consist in leisure_, says Aristotle;[1] and
Diogenes Laertius reports that _Socrates praised leisure as the
fairest of all possessions_. So, in the _Nichomachean Ethics_,
Aristotle concludes that a life devoted to philosophy is the happiest;
or, as he says in the _Politics,[2] the free exercise of any power,
whatever it may be, is happiness_. This again, tallies with what
Goethe says in _Wilhelm Meister: The man who is born with a talent
which he is meant to use, finds his greatest happiness in using it_.

[Footnote 1: Eth. Nichom. x. 7.]

[Footnote 2: iv. 11.]