How can Christians keep themselves in the love of God?

To keep ourselves in the love of God, as Jude 1:21 emphasizes, means to continuously act in love towards others, particularly fellow believers. This is not about earning God's love but expressing the love that we've already received through service and humility. Genuine love is evidenced by selflessness and a willingness to sacrifice for others, echoing Jesus’ command to love one another as He loved us. This lifestyle of service aligns us with God's heart and maintains the fellowship that is essential for spiritual growth and perseverance.