preserved in their love

Judas 21
21 Keep yourselves in the love of God, expecting the mercy of our Lord Jesus Christ, for eternal life.

Source
The love of God is an incomparable and infinite love that is worthy to receive but also to express it, because the love of God is like light can not be hidden.
The advice of Judas for its readers is that they keep in the love of God because there have always been those who try to divert the people of God from their love and great purpose. Whether they are angels or human beings, God knows how to deal with the rebels, but believers are warned not to make common cause with such people, not to relate or engage with those who divert their lives against biblical principles, for it is true that the impious appeal to the desire of the eyes, of the flesh and unhealthy pride. They pretend to love God, they seem to do good deeds, but when they are closely watched, they are as sterile as the fig tree that Jesus cursed.

For this reason the presence and goodness of God must be a reality in our lives. We must live in such a way that we can keep ourselves in the sweet and powerful love of God.
There is no better way to show that Jesus is in our lives than to live a life full of attitudes of his love, a life full of fruits of the spirit that give testimony of what God has done in us and all for his love.
We must understand that Jesus loved us first and therefore we must love him in response to that great love.

Let us keep that great love in our lives by loving our neighbor every day, obeying his word and living an abundant and fruitful life with our attitudes.