The first requirement for development of the fruit of the Spirit is life. Just as life in the natural world comes through seed, life in the spiritual world came through the Seed of Jesus Christ.
In the first promise of a Savior of the world, Jesus was called a Seed:
And I will put enmity between thee and the woman, and between thy seed and her seed; it shall bruise thy head, and thou shalt bruise his heel. (Genesis 3:15)
In Jesus Christ [the Seed] is the life required to produce spiritual fruit:
In Him was life; and the life was the light of men. (John 1:4)
For as the Father hath life in Himself; so hath He given to the Son to have life in Himself. (John 5:26)
...I am come that they might have life and that they might have it more abundantly. (John 10:10)
That Seed of life, Jesus Christ, must be living in you. You cannot produce the fruit of the Spirit if you do not have a personal relationship with Him because...