Because the newer methods of treatment are good, it does not follow that the old ones were bad: for if our honorable and worshipful ancestors had not recovered from their ailments, you and I would not be here today.
First and foremost, be faithful to your superiors, keep all promises, refuse the friendship of all who are not like you; and if you have made a mistake, do not be afraid of admitting the fact and amending your ways.
There are 3 elements essential in the matters of the State, Food, Military equipment, and Confidence of the people in the ruler. Of these 3, Military Equipment is the least important, Food being the 2nd important, and Confidence of the people being the MOST important. All men rather die of starvation than in war, but nevertheless all men do die of old age. Lacking in Confidence from the people, a state cannot survive.
By three methods we may learn wisdom: First, by reflection, which is noblest; Second, by imitation, which is easiest; and third by experience, which is the bitterest.