To summarize the essence of samuraihood, first and foremost the warrior must be devoted body and soul to his lord. In addition, he must internalize the virtues of wisdom, benevolence, and courage. Although it may seem impossible for ordinary men to embody these three virtues, it really is easy. To obtain wisdom simply requires listening to others. Immeasurable knowledge comes from this. Benevolence is for the sake of others. Comparing yourself with others, benevolence is opting to do good for other people. Courage is found through "gritting one's teeth." That is to say, gritting one's teeth and charging forth without worrying about the consequences. There is no higher mind-set than this.
(Book 2, entry 7 from Tuttle 2014)
By fastening several bags of cloves to your body, you will not be adversely affected by inclement weather or catch a cold. One year, when the late Kazuma traveled back to the domain on horseback as a messenger in the midst of a cold snap, his health was not diminished in the slightest despite his old age [because he knew about the quality of cloves]. He taught me this.