"As the branch cannot bear fruit of itself, unless it abides in the vine, neither can you, unless you abide in Me." John 15:4, NKJV
The branches of a vine "abide" by just remaining connected to the vine. Permanently. Consistently. Day after day, week after week, year after year. They simply rest in their position, allowing the sap of the vine to flow freely through them. They exert no effort of their own. The fruit that is subsequently borne on the branch is actually produced by the life-giving sap within.
To abide in Christ means to remain connected to Him so completely that the "sap" of His Spirit flows through every part of your being, including your mind, will, and emotions as well as your words and deeds. The "fruit" that you then bear is actually produced by His Spirit in you through no conscious effort of your own. If you and I want to be fruitful, we do not concentrate on fruit-bearing; we concentrate on our personal relationship with Jesus Christ.