The streets of Jerusalem, circa 33 AD; between the Last Supper and His arrest in the Garden of Gethesame, Jesus speaks to His Disciples (“the Farewell Discourse”):

“I am the vine; you are the branches. Whoever abides in me and I in him, he it is that bears much fruit, for apart from me you can do nothing. If anyone does not abide in me he is thrown away like a branch and withers; and the branches are gathered, thrown into the fire, and burned. If you abide in me, and my words abide in you, ask whatever you wish, and it will be done for you. By this my Father is glorified, that you bear much fruit and so prove to be my disciples.” John 15:5-8 ESV

Spiritual fruit is created through abiding in Christ. The difference between spiritual fruit and human religious activity is that spiritual fruit brings glory to God.