1. Anyone who cannot educate himself cannot educate others. ——Suhomlinsky

2. Teachers should be good at organizing, taking action, and using wit. They should be happy and angry at the right time. Teachers should allow every move they make to educate themselves, and they should always know what they want and what they don’t want at that time. If a teacher doesn't understand this, who else can he teach? ——Makarenko

3. You must know that words spoken by living people do not solely rely on their content to stimulate the thoughts and feelings of the other party. Here is the cheerful face of the interlocutor. There is a pair of eyes that one moment burns with praise in front of the great achievements of science, and the other moment seems to squint as if doubting the correctness of the conclusions made, with expressions and gestures...

——Zankov