A knowledgeable person who does not practice is like a bee who does not make honey. - Saadi (Persia)

Practice is a great whistleblower, it exposes all deceitful people. Self-deception.——Chernyshevsky (Russia)

How can a person know himself? Not through thinking, but through practice.——Goethe (Germany)

< p> It is the greatest misfortune for theory to be divorced from practice. - Leonardo da Vinci

What you learn on paper will eventually make you realize it, but you will definitely know that it must be done in practice. - Lu You

Experience is The eternal teacher.——Goethe