The letter gave a promise of greater happiness.

【promise】那封信预示了更大的快乐。

Heidi understood, and gave a promise to sit quietly during her lessons from that time on.

海蒂明白了， 并答应从那时起上课时安静地坐着。

Axel takes no heed. He had given a promise to God not to be vengeful, not to tell of what Brede had done, but beyond that he was free. And what was Brede going up that way again for now?

阿克塞尔不理会。他向上帝承诺不会报复，不会说出布雷德的所作所为，但除此之外，他是自由的。布雷德现在又往上走是为了什么？