The promise of everlasting life can be a powerful motivation and source of hope for missionaries and believers alike. In the context of Jude 20-21, these verses encourage individuals to build themselves up in faith and remain focused on God's love and mercy. For a longtime missionary, this promise may provide strength and endurance through difficult experiences, challenges, and setbacks.
Knowing that their efforts in spreading the Gospel are part of a larger plan that transcends this life can inspire a sense of purpose and commitment. The belief in everlasting life can help them persevere through hardships, remain dedicated to their mission, and inspire others to seek a relationship with God. Overall, the assurance of everlasting life reinforces the value of their work and encourages them to continue sharing their faith with others.