2 kinds of people hard to find

Two kinds of people hard to find in the world:

1. One who will do a favor or kindness first.

2. One who is grateful for a favor done and feels obligated to repay it.

(Anguttara Nikaya 2.119)

References

• The Complete Book of Buddha's Lists -- Explained. David N. Snyder, Ph.D., 2006.
• http://www.thedhamma.com/