So, since you were saved, you have NEVER sinned? Is sin bad fruit?
Eph 4:23 And be renewed in the spirit of your mind;
Eph 4:24 And that ye put on the new man, which after God is created in righteousness and true holiness.
In case you didn't know, we have two different spirit persons in us. One has a seed or offspring of the devil in him and the other has the flesh and blood of Jesus in him.
These two spirits are contrary to each other.
If you let the old man go unchecked, you will find yourself sinning, because it will be the devil leading you through the old man.
If you follow after the other man and let him/her do the leading, which is the same as the Spirit of God leading you through the new man, then you will do righteous acts.
Point being, not everything is of and from God.
Again, JESUS SAID, a good tree CANNOT produce bad fruit. And since He said it, it is the way things are.