Criticize in private， praise in public.
私下批评，公开表扬。
When a professor insists computer science is X but not Y, have compassion for his graduate students.
当教授坚持说计算机科学是X但不是Y时，请对他的研究生抱有同情心。
Don't interfere with anything in the Constitution. That must be maintained, for it is the only safeguard of our liberties. And not to Democrats alone do I make this appeal, but to all who love these great and true principles.