1. For people, the greatest joy and happiness is to dedicate their spiritual strength to others. (Khomlinsky)

2. All I have to do is serve truth and justice with my meager strength. (Einstein)

3. Do your best to fulfill your obligations, and you should know how valuable you are. (Leo Tolstoy)

4. Labor is an inevitable obligation for everyone in society. (Rousseau)

5. Physical labor is the great disinfectant against all social viruses.

(Marx)