告往知来

Explanation: Told this, you can know another point. Analogy to understand the similarities and differences of things, a causal relationship, whereby know the enemy. 　　Source: "Analects of Confucius" thanks also, beginning with words "poetry" are gone, all to report to those with knowledge. " 　　Examples: And, thanks to business poems, learn painting, ~. (Qing Wei Yuan "Poetry Buesching letterhead order")