One of the old Church fathers said that we cannot better understand the Trinity than as a revelation of divine love--the Father, the loving One, the Fountain of love; the Son, the beloved one, the Reservoir of love, in whom the love was poured out; and the Spirit, the living love that united both and then overflowed into this world. 

The Spirit of Pentecost, the Spirit of the Father, and the Spirit of the Son is love. And when the Holy Spirit comes to us and to other men, will He be less a Spirit of love than He is in God? 

It cannot be; He cannot change His nature. 

The Spirit of God is love, and "the fruit of the Spirit is love."

Humanity Needs Love

Why is that so? That was the one great need of mankind, that was the thing which Christ's redemption came to accomplish: to restore love to this world. When man sinned, why was it that he sinned? Selfishness triumphed—he sought self instead of God. And just look! Adam at once begins to accuse the woman of having led him astray. 

Love to God had gone.

Love to man was lost. 

Look again: of the first two children of Adam the one becomes a murderer of his brother. Does not that teach us that sin had robbed the world of love? Ah! What a proof the history of the world has been of love having been lost! There may have been beautiful examples of love even among the heathen, but only as a little remnant of what was lost. One of the worst things sin did for man was to make him selfish, for selfishness cannot love.

The Lord Jesus Christ came down from Heaven as the Son of God's love. 

"God so loved the world that He gave His only begotten Son" (John 3:16). 

God's Son came to show what love is, and He lived a life of love here upon earth in fellowship with His disciples, in compassion over the poor and miserable, in love even to His enemies, and He died the death of love. And when He went to Heaven, whom did He send down? The Spirit of love, to come and banish selfishness and envy and pride, and bring the love of God into the hearts of men.