up to reason is to be up to the standard of humanity. Human progress
is progress on the lines of reason. To make for that progress, and
thereby to be morally good, an act must be done, not blindly,
brutishly, sottishly, or on any impulse of passion, however beneficial
in its effects, but deliberately, and in conscious accordance with the
reasonable nature of the doer.

5. Whatever be man's end and highest good, he must go about to compass
it reasonably. He must plan, and be systematic, and act on principle.
For instance, if the public health be the highest good, the laws which
govern it must be investigated, and their requirements carried out,
without regard to sentiment. If pleasure be the good, we must be
artists of pleasure. If, however, as has been seen (c. ii.) the
highest good of man is the highest play of reason herself in a life of
contemplation, to be prepared for, though it cannot be adequately and
worthily lived, in this world, then it is through following reason,
through subjecting appetite to reason by temperance, and the will to
reason by justice, and reason herself by a "reasonable service" to
God, that this end and consummation must be wrought out. Thus, in
Plato's phrase (_Rep._, 589 B), the moral man acts so that "the inner
man within him, the rational part of his nature, shall be strongest;
while he watches with a husbandman's care over the many-headed beast
of appetite, rearing and training the creature's tame heads, and not
letting the wild ones grow; for this purpose making an ally of the
lion, the irascible part of his nature, and caring for all the parts
in common, making them friends to one another and to himself." In this
way he will meet the true exigency of his nature _as a whole_, with
due regard to the proper order and subordination of the parts. He who
lives otherwise, acts in contradiction to his rational self. (c. v.,
s. iii., n. 3, p. 74).