路遥知马力，日久见人

Explanation: 【Source】 element Anonymous "war debt of gratitude" First off: "you would like to have my sister long life and prosperity, if some children anyhow, I am indispensable to repay her sister's grace, may the road away from a horse, time will tell." Explanation】 【 long way to know the size of the horse strength, long time to see people's good or bad. 【Example】 but "~" in the long and brutal war, guerrilla warfare will be the performance of its