路遥知马力，日久见人心 A long road shows a horse’s strength. A long time shows a person’s heart. The saying appears in a Yuan play, The Fight to Repay Kindness (争报恩).
信用 Credit, trustworthiness. The Handian dictionary defines it as “the trust gained by keeping one’s promises.” Its example: “He is a person who keeps his word. Since he said he would help, he will surely help.”