The other hand holds a ring, which is the ring of promise: it reminds a Zoroastrian always to keep one's promises.

另一只手拿着圆环，那是许诺的圆环，提醒琐罗亚斯德教徒应当遵守他的承诺。

And some other rules are to build up the kids' character in order that he or she can live a life of high quality, such as delay of gratification, keep one's promise.

而有些原则是锻炼孩子的品质，让他可以更高质量地生活，比如延迟满足，说到就要做到等。

One should keep to one's promise.

一个人应当信守诺言。