Takeda Shingen citations

“Learning is to a man as the leaves and branches are to a tree, and it can be said that he should not be without it. Learning is not only reading books, however, but is rather something that we study to integrate with our own way of life.
One who is born into the house of a warrior, regardless of his rank or class, first acquaints himself with a man of military feats and achievements in loyalty, and, listening to just one of his dictums each day, will in a month know 30 precepts. Needless to say, if in a year he learns 300 precepts, at the end of that time he will be much the better.
Thus, a man can divide his mind into three parts: he should throw out those thoughts that are evil, take up those ideas that are good, and become intimate with his own wisdom… I would honor and call wise the man who penetrates this principle, though he lacks the knowledge of a single Chinese character. As for those who are learned in other matters, I would avoid them regardless of how deep their knowledge might be. That is how shallow and untalented this monk is.”