One of the deep mysteries of Christ is that, in Christ, these are all one God is love - the eternal love between the Holy Trinity, this is Who God is.
God is the love that He gives to us, He is the love He is for us His Spirit is the love the binds the Church together.
The Word of His love in the Cross of Christ on which He bore the punishment for our sin which separated us from this love, is the hope for others that He calls to be one with Him (and us) in Christ