Courtesy of the DDR (East German) Museum Pirna, a plaque with guidance for teachers:
Golden Rules for Teachers' Work
Make an Effort to Maintain Ideological Clarity!
Take Up a Firm Fundamental Position!
Be Balanced! Guard Against Cynicism!
Judge Your Work Realistically and Be Critical of Yourself!
Recognize Successes! Use Scolding Rarely!
Trust and Love Children!
Respect the Pupil! Give Him Responsibility!
Convince, Don't Browbeat!