What is fruitfulness? 什么是结果子?

1. To man, it is the faith in Jesus - firstfruits. To God, A Jesus is the firstfruits, who completed salvation and established man's faith. B. believers are the firstfruits of God's work.
Anyone who is justified by faith is fruitful, because Jesus is the firstfruits of our faith.

In summary, the rebirth of man by God's Gospel/word, who is hence justified by faith in Jesus Christ is the firstfruits of believers, based on the firstfruits of Jesus Christ who accomplished the mission of salvation and founded the faith of man.

雅各书 - 第 1 章 第 18 节
他按自己的旨意，用真道生了我们，叫我们在他所造的万物中，好像初熟的果子。

He chose to give us birth through the word of truth, that we might be a kind of firstfruits of all he created.

Comments: The believers that were born through the word of truth are the firstfruits of God's work.

哥林多前书 - 第 15 章 第 20 节
但基督已经从死里复活，成为睡了之人初熟的果子。
But Christ has indeed been raised from the dead, the firstfruits of those who have fallen asleep.

Comments: Jesus is the firstfuits of believers, who believe in his resurrection; That is: Jesus completed  the mission of salvation, and is the foundation of faith,corresponding to 

希伯来书 12
2 仰望为我们信心创始成终的耶稣。（或作仰望那将真道创始成终的耶稣）他因那摆在前面的喜乐，就轻看羞辱，忍受了十字架的苦难，便坐在神宝座的右边。 
Let us fix our eyes on Jesus, the author and perfecter of our faith, who for the joy set before him endured the cross, scorning its shame, and sat down at the right hand of the throne of God.

哥林多前书 - 第 15 章 第 23 节
但各人是按着自己的次序复活。初熟的果子是基督。以后在他来的时候，是那些属基督的。But each in his own turn: Christ, the firstfruits; then, when he comes, those who belong to him.

Comments: see above.

2. It is the fruit of spirit - sanctification.
The fruit of spirit is prize/reward from God. The fruit of spirit is in fact sanctification in a late stage of faith in Jesus Christ. It is not necessary to bear the fruit of spirit to be saved. That is, the criterion of being saved is NOT based on fruit of spirit, but on faith. 

加拉太书 - 第 5 章 第 22 节
圣灵所结的果子，就是仁爱，喜乐，和平，忍耐，恩慈，良善，信实，

以弗所书 - 第 5 章 第 9 节
光明所结的果子，就是一切良善，公义，诚实。

关键词搜索：“奖赏” 返回 3 条经文， 显示第 1 - 3 条

1. 哥林多前书 - 第 9 章 第 24 节
岂不知在场上赛跑的都跑，但得奖赏的只有一人。你们也当这样跑，好叫你们得着奖赏。

2. 腓立比书 - 第 3 章 第 14 节
向着标竿直跑，要得神在基督耶稣里从上面召我来得的奖赏。

3. 歌罗西书 - 第 2 章 第 18 节
不可让人因着故意谦虚，和敬拜天使，就夺去你们的奖赏。这等人拘泥在所见过的，（有古卷作这等人窥察所没有见过的）随着自己的欲心，无故地自高自大，