Idiomatic Story of Returning Virtue with Gratitude

Repaying Virtue with Virtue - Virtue: favors. Repay favors with favors.

Repaying Virtue with Resentment - Resentment: hatred; Virtue: favor. Repaying someone's favor with resentment.

Repaying Virtue with Knowledge of Gratitude - Receiving favors from others with a grateful intent to repay

Knotting Grass to Ring - An old metaphor for being grateful for repaying a favor to the end of one's life.

Enemies' Favor and Enemies' Grudge - as in repaying kindnesses and grudges.

Suizhu and Bik - a parallel name for Suihou Zhu and Heshi Bik. Legend has it that in ancient times, the vassal with the surname of Ji saw a large snake wounded and broken, and healed with medicine; after the snake in the river with the bright moon beads in return for the virtue, because it is said to be with the marquis beads, also known as the spirit of the snake beads. Chu Bian and in the Jing Mountain got a diamond, has offered to King Wu, King Wen, are thought to be stone, and the crime of deceiving the king was cut off two feet; King Cheng ascended to the throne, so that people dissected the diamond, the fruit of the luminous jade, because of the name of the said and the Bik. See Han

Knotting Grass - Knotting Grass: Knotting grass into a rope to save a benefactor; Knotting Ring: Holding a jade ring in the mouth. In the old days, it was used as a metaphor for being grateful for a favor and not forgetting it until one's death.

Knowing and repaying favors--knowing the favors others have done to one's own, one returns the favors to others. It is also known as "knowing favors and repaying virtues".