There is nothing else you have to do today that is as important as what you are about to do right now. God has a message for you from first, second and third John. John was the last apostle to die, and one who was so dear to Jesus. His writings contain numerous commands to "love one another." John seemed to think love was the answer to everything. Looking at the world today, it would seem like he has a good point.
Please read these three short epistles and see for yourself. Go ahead and read the small book of Jude as well.
We have already established through scripture that a person can fall away from God's grace. But does that mean we are always teetering on the edge, right on the verge of being cast into hell? When we sin as Christians, we should humbly repent, confess our sins and turn back to God. But we do not lose our relationship with Christ during this process even for one moment. "But if we walk in the Light as He Himself is in the Light, we have fellowship with one another, and the blood of Jesus His Son cleanses us from all sin." (I John 1:7). If you are making the effort to walk in the light you are safe because of the cleansing blood of Christ. On the other hand, if you choose not to walk in the light, and persist in rejecting His goodness, then you are in danger of eternal condemnation (Hebrews 10:26-31). You will stumble at times, but as long as you repent and stay close to the Lord you have nothing to fear. Your soul is secure.
Jude, like James, was another half-brother of Jesus, Jude 1:1. They did not follow Jesus until later on in His ministry. This is a small but insightful letter which I hope you found beneficial in your reading.