Immanuel Kant

(22 April 1724 – 12 February 1804) German philosopher (a native of the Kingdom of Prussia) and one of the central Enlightenment thinkers.

A habit is never good, even a habit of doing good deeds. Good deeds, after they become habits, are no longer acts of virtue. Real good is achieved only with effort.
A huge amount of knowledge is accumulated at present. Soon our abilities will be too weak, and our lives too short, to study this knowledge. We have vast treasures of knowledge at our disposal but after we study them, we often do not use them at all. It would be better not to have this burden, this unnecessary knowledge, which we do not really need.
If beautiful art does not express moral ideas, ideas which unite people, then it is not art, but only entertainment. People need to be entertained in order to distance themselves from disappointment in their lives.
One of the best and purest joys is having a rest after labor.