Whereas the gift of the spirit is what we use, the fruit is how we live.
How we live pleases God far more than what we do.
God takes no delight in using his children as much as in relating with them.
Fruit of the spirit keeps our conscience awake to the activities of the gifts of the Holy Spirit.
Samson was so gifted by the spirit but he lacked the fruit of spirit and so he crashed at the middle of his life.
The charismatic emphases liberty of the spirit, but it is the fruit of the spirit that safe guards the gift from tearing apart.