孔子出题孙子监考老子不会

Roughly translates to 'Confucius poses the question; his descendants oversee the exam while Laozi himself does not know (the answers).' It's somewhat comical, referencing three major Chinese philosophers—Confucius (representing authority on wisdom and tradition questions), his lineage/teachings, and Laozi (founding Taoism) respectively—in order to playfully illustrate situations concerning wisdom passing down within context of education and philosophy studies.