Paul in his epistle to the Ephesians is explaining to us that God's love (agape, love of charity) is beyond all human reason and its ability to reach the truth: "and to know this love that surpasses knowledge - that you may be filled with all the fullness of God", Ephesians 3:19.
The love of God as explained by the apostle is related to a special form of perception: "so that Christ may dwell in your hearts through faith. And I pray that you, being rooted and established in love, may have power, together with all the Lord's holy people, to grasp how wide and long and high and deep is the love of Christ", Ephesians 3:17-18.
We see this in the dialogue between Jesus and Nicodemus. Nicodemus is a doctor of the Law of Moses and he cannot understand this love. This is so because there is an intermediate state between good and evil.
To understand this love that gives us the fullness of God as a spiritual gift, a sincere conversion is necessary above all, that is, a sincere justification, that is, the passage from a life full of sins to a life of righteousness (golden rule, Matthew 7:12).
An example of this is the conversion of Matthew: "As Jesus went on from there, he saw a man named Matthew sitting at the tax collector's booth. "Follow me", he told him, and Matthew got up and followed him.
While Jesus was having dinner at Matthew's house, many tax collectors and sinners came and ate with him and his disciples. When the Pharisees saw this, they asked his disciples, ´Why does your teacher eat with tax collectors and sinners?´
On hearing this, Jesus said, ´It is not the healthy who need a doctor, but the sick. But go and learn what this means: I desire mercy, not sacrifice. For I not come to call the righteous, but sinners.´" Matthew 9:9-13.
We cannot receive the fullness of God if we practice error and follow heresies. It is through the constant practice of mercy that we understand this love. The spiritual gifts purify us and gradually bring us closer to the truth and to the love of God. Once purified by the gifts, we receive the love of charity and contemplative activity.
The fullness of God in us is reached when through the contemplative activity the character traits of God are formed in us: "love, joy, peace, forbearance, kindness, goodness,faithfulness, gentleness, self-control", Galatians 5:22-23
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