Companionship plays a large role in the life of Christians and non-Christians alike. It is wonderful to possess friends and loved ones with whom you can reveal the inner workings of your heart without fear, rejection, and spite. We don't need to explain ourselves or our emotions to these loved ones. They know us just as we know them. The Father, Son, and Spirit experience this mutual love, openness, and adoration in a manner that cannot be explained or replicated. When Jesus rejoiced in the Spirit, He marveled at the work of His companion, the Holy Spirit, who sought to bring about the purposes of the Father so that the Savior, who He had nurtured and preserved throughout His entire life, might achieve the joy the Father had intended for Him since the beginning of time.