“If anyone thirsts, let him come to Me and drink. He who believes in Me, as the Scripture has said, out of his heart will flow rivers of living water.” … this He spoke concerning the Spirit, Whom those believing in Him would receive…
When you are born of Yahweh by believing the death of Jesus became payment for your failures, you begin what can become a life of much manifestation of the Spirit of Jesus. To manifest means to become apparent, or visible. It doesn’t mean to “appear,” but to be perceived. The Spirit of Jesus is present in you somehow all the time, but when you bear the fruit of His presence, Joy, Love, etc, (Galatians 5:22,23), He becomes apparent: He manifests.
He is manifest when you do the supernatural things that relate to the gift He has given you. When you teach (if you are a teacher), when you evangelize (if you are an evangelist), whatever work of His you let Him do through you, causes Him to be experienced by the people who are nearby.
He flows through you and becomes a river of Living Water.