日月晖于外，其贼在于内，谨备其所憎，而祸在于所爱。
解释：日月的光辉照亮了大地，可它们的内部仍然有黑点，人们谨慎地看待自己憎恶的人，而祸患常常发生在溺爱的人身上。
It is only through enforced standardization of methods, enforced adoption of the best implements and working conditions, and enforced cooperation that this faster work can be assured.
Your most unhappy customers are your greatest source of learning.
真正的民主只能存在于社会主义社会中。