First off, please don't be offended by the title. It's a take off of "it's the economy Stupid". In politics, the economy is used to evaluate the health of a country. In a relationship with Yahusha, in this Christian walk, Following the Way, your fruit is how you evaluate your spiritual health.
A simple google search gives this result: "fruits of the Spirit" are a list of nine qualities or virtues that the Bible says are produced in believers' lives by the Holy Spirit. These fruits, as described in Galatians 5:22-23, are love, joy, peace, patience, kindness, goodness, faithfulness, gentleness, and self-control.
We can go deeper, I Corinthians 13:1-13 gives us a detailed definition of Biblical love. The Psalms are a treasure trove of wisdom concerning peace, joy, and faithfulness. The Proverbs guide us through patience, self control and many other virtues. You can find counsel concerning good fruit throughout the canonized books and the extra biblical books.
Knowledge of the Fruit of the Spirit and operating in these virtues are two different things. These are Fruits of the Spirit. These virtues are a result of abiding in the Holy Spirit. Allowing the Ruach (Spirit) to change you, grow you, chastise you, and heal you, will bring about this good fruit.
Have you ever interacted with a person and then were surprised to learn they claim to be a Christian? Why do you suppose their faith wasn't apparent? Could it be that you didn't see the good fruit? Perhaps you noticed some rotten fruit? I hear people quote Scriptures all the time and turn right around and act unkind. I've been using those moments to self evaluate: I don't want to see that rotten fruit in myself.
Take a good look at your fruit! Others are. Your good fruit can be a witness to others. Your bad fruit will also witness, just not in a way that blesses.
A work in progress
Teresa