There are two items present in any healthy, growing personal relationship, visible or invisible: love and trust. Love and trust are inseparable. You cannot have one without the other. In Peter's first letter addressed to the dispersed believers fleeing severe persecutions under Rome, he reminds them that even though Jesus isn't present physically, they still love and trust Him fully and that causes deep joy in their personal relationship with Christ. This truth can bring joy in your personal relationship with Christ as well.