“The theme of union with Christ occurs in numerous places in the [Word of God]. It is that union enjoyed by believers, individually and corporately, with the Lord Jesus. It is sometimes referred to as the ‘unio mystica’ or mystic union, as its fact is established without understanding the mechanism.” (That is, we don’t really comprehend how it happens or is a reality in us.) – Theopedia
Mostly because new age and Eastern religion has so twisted it, the word “mystic” brings negative connotations to our minds. But there are those who are considered Christian mystics. Some we must avoid, as they too have fallen into the new age deception of thinking they become gods themselves, but others truly live the truth. So let’s make this practical:
In relation to being a Christian, the term mystic refers to one whose sole aim is to be in union with God. Simply, it is the mystery of a Biblical truth that we can be one with God. This is illustrated well by the picture of a husband and wife whom the Word says become one flesh.
In John 15, Jesus uses the picture of the vine and its branches to describe the relationship He desires with us. The vine and branches are one yet not the same, and the branches cannot thrive without the vine. Only God could make such a thing possible and He has done so through Christ’s sacrifice all because Love (God) loves to love!
As stated before, many make this far too complicated or turn Christian mysticism into something it is not. Know this: We are NOT God and we will never be. Remember: If it exalts self above Christ it is wrong!
Union with God is about us becoming a people unified with His heart and each other, who care more about Jesus and what He cares about than ourselves. It is about becoming a people who seek to give all of themselves to love God and to love others as He loves. It’s about becoming closer to Him daily as our most important relationship.
We deny ourselves and let God’s will reign in our lives and beings, so that we can live as reflections of Christ and grow in love (1 Corinthians 13), whether through moments of joy or times of suffering. He uses all things for our good and in order to conform us to the image and character of Christ (Romans 8:28-29).
Know that this can come ONLY through you having a personal relationship with Jesus Christ that is an ever-deepening connection to Him in fellowship and surrendering yourself. It is not some surreal, dream-like or far away thing, but true connection to a person who happens to be the most important One of all: God!
“For this reason a man shall leave his father and his mother and shall be joined to his wife, and the two shall become one flesh. This mystery is very great, but I speak concerning [the relation of] Christ and the church.”
(Ephesians 5:31-32 AMP)