The heat of battle blinded him, and he gave no thought to the lives he was uselessly sacrificing. Here remorse gnaws the vitals of the unwise. Here the true wisdom is revealed. It is said that experience is a dear school, and only the wise learn therein. This carries with it its own nullification, like many of the intellect's wise observations.
Experience is the school of fools.
The truly wise do not take lessons within her doors. There are two ways to get understanding. One is to follow the guidance of the Spirit that dwells within, and the other is to go blindly ahead and learn by hard experience. These two ways are open to everyone. It is recognized by the man who has had experience that he can advise the one who has not and thus save him the laborious steps of that rocky road.