We assume a common sense as the necessary condition of the universal communicability of our knowledge, which is presupposed in every logic and every principle of knowledge that is not one of skepticism.
Immanuel KantIt is difficult for the isolated individual to work himself out of the immaturity which has become almost natural for him.
Immanuel KantManners or etiquette ('accessibility, affability, politeness, refinement, propriety, courtesy, and ingratiating and captivating behavior') call for no large measure of moral determination and cannot, therefore, be reckoned as virtues. Even though manners are no virtues, they are a means of developing virtue.... The more we refine the crude elements in our nature, the more we improve our humanity and the more capable it grows of feeling the driving force of virtuous principles.
Immanuel KantThrift is care and scruple in the spending of one's means. It is not a virtue and it requires neither skill nor talent.
Immanuel Kant