[Skull]

And virtue is not only of the heart; it is of the intellect also; and without this virtue of the intellect, the virtue of the heart is imperiled. Reason, like passion, has its vices. Metaphysical speculations are the riot of the intellect, as sensuality is the riot of the affections. The highest flights of speculation—pleasing as they are—reveal no place of rest, and the strained mind must return to facts and moral principles to find that truth which it seeks. As the soaring bird returns for refuge and rest to its nest in the rock, so must the speculative thinker return to the rock of virtue for surety and peace.

From The Life Triumphant