I understand now what Jesus meant by "Thus you will know them by their fruits".
Notice He doesn't say you will know them by their actions or by their behavior. He uses the idea of fruit for a very good reason. You see, a good man will naturally produce good and an evil man will naturally produce evil. "For out of the abundance of the heart his mouth speaks".
Can you pick grapes from a bramble bush? How then can good fruit come from someone who has dedicated their life to Christ? If a good man, out of his good treasure, brings forth good, then what need is there in dedication and striving? Should not the work actually be then to simply remain in Christ?
Jesus said if you continue in His Word, you are His disciples indeed. What is His Word? Is it not the gospel? Why do we leave to Vine in order to try and produce something good for God? Is it not finished? Is He not also our sanctification and redemption, along with our salvation? Or does God's grace simply stop at the cross? Does it not go on to the resurrection?
This is very hard for me to articulate. But I hope and pray to God that this truth of the fruit of the Spirit would be a reality in my life. That I would simply "be" and cease striving and worrying.